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Create a new file with name post-form.php
at path
buddyboss-child/buddypress/activity/post-form.php

It will allow you to override the Avatar div
Most of area whats-new-textarea is controled by BuddyPress JS and other BuddyPress specific js thus adding new div inside it may cause functionality issue

<?php
/**
 * BuddyPress - Activity Post Form
 *
 * @package BuddyPress
 * @subpackage bp-legacy
 */

?>

<form action="<?php bp_activity_post_form_action(); ?>" method="post" id="whats-new-form" name="whats-new-form" role="complementary">

	<?php

	/**
	 * Fires before the activity post form.
	 *
	 * @since 1.2.0
	 */
	do_action( 'bp_before_activity_post_form' ); ?>

	<div id="whats-new-avatar">
		<a href="<?php echo bp_loggedin_user_domain(); ?>">
			<?php bp_loggedin_user_avatar( 'width=' . bp_core_avatar_thumb_width() . '&height=' . bp_core_avatar_thumb_height() ); ?>
		</a>
	</div>

	<p class="activity-greeting"><?php if ( bp_is_group() )
		printf( __( "What's new in %s, %s?", 'buddypress' ), bp_get_group_name(), bp_get_user_firstname( bp_get_loggedin_user_fullname() ) );
	else
		printf( __( "What's new, %s?", 'buddypress' ), bp_get_user_firstname( bp_get_loggedin_user_fullname() ) );
	?></p>

	<div id="whats-new-content">
		<div id="whats-new-textarea">
			<label for="whats-new" class="bp-screen-reader-text"><?php _e( 'Post what\'s new', 'buddypress' ); ?></label>
			<textarea class="bp-suggestions" name="whats-new" id="whats-new" cols="50" rows="10"
				<?php if ( bp_is_group() ) : ?>data-suggestions-group-id="<?php echo esc_attr( (int) bp_get_current_group_id() ); ?>" <?php endif; ?>
			><?php if ( isset( $_GET['r'] ) ) : ?>@<?php echo esc_textarea( $_GET['r'] ); ?> <?php endif; ?></textarea>
		</div>

		<div id="whats-new-options">
			<div id="whats-new-submit">
				<input type="submit" name="aw-whats-new-submit" id="aw-whats-new-submit" value="<?php esc_attr_e( 'Post Update', 'buddypress' ); ?>" />
			</div>

			<?php if ( bp_is_active( 'groups' ) && !bp_is_my_profile() && !bp_is_group() ) : ?>

				<div id="whats-new-post-in-box">

					<?php _e( 'Post in', 'buddypress' ); ?>:

					<label for="whats-new-post-in" class="bp-screen-reader-text"><?php _e( 'Post in', 'buddypress' ); ?></label>
					<select id="whats-new-post-in" name="whats-new-post-in">
						<option selected="selected" value="0"><?php _e( 'My Profile', 'buddypress' ); ?></option>

						<?php if ( bp_has_groups( 'user_id=' . bp_loggedin_user_id() . '&type=alphabetical&max=100&per_page=100&populate_extras=0&update_meta_cache=0' ) ) :
							while ( bp_groups() ) : bp_the_group(); ?>

								<option value="<?php bp_group_id(); ?>"><?php bp_group_name(); ?></option>

							<?php endwhile;
						endif; ?>

					</select>
				</div>
				<input type="hidden" id="whats-new-post-object" name="whats-new-post-object" value="groups" />

			<?php elseif ( bp_is_group_activity() ) : ?>

				<input type="hidden" id="whats-new-post-object" name="whats-new-post-object" value="groups" />
				<input type="hidden" id="whats-new-post-in" name="whats-new-post-in" value="<?php bp_group_id(); ?>" />

			<?php endif; ?>

			<?php

			/**
			 * Fires at the end of the activity post form markup.
			 *
			 * @since 1.2.0
			 */
			do_action( 'bp_activity_post_form_options' ); ?>

		</div><!-- #whats-new-options -->
	</div><!-- #whats-new-content -->

	<?php wp_nonce_field( 'post_update', '_wpnonce_post_update' ); ?>
	<?php

	/**
	 * Fires after the activity post form.
	 *
	 * @since 1.2.0
	 */
	do_action( 'bp_after_activity_post_form' ); ?>

</form><!-- #whats-new-form -->

Regards

yes, it is not available in parent theme
and it still need customization of Avatar div

<div id="whats-new-avatar">
		<a href="<?php echo bp_loggedin_user_domain(); ?>">
			<?php bp_loggedin_user_avatar( 'width=' . bp_core_avatar_thumb_width() . '&height=' . bp_core_avatar_thumb_height() ); ?>
		</a>
	</div>

inside the content area div
Just moving Avatar div inside the content are div will not work properly
It will also need additional custom work.

Please wait couple of days i will work on it and will provide complete solution with css.

Regards

Hi @karlos

buddyboss-child/buddypress/activity/post-form.php

<?php
/**
 * BuddyPress - Activity Post Form
 *
 * @package BuddyPress
 * @subpackage bp-legacy
 */

?>

<form action="<?php bp_activity_post_form_action(); ?>" method="post" id="whats-new-form" name="whats-new-form" role="complementary">

	<?php

	/**
	 * Fires before the activity post form.
	 *
	 * @since 1.2.0
	 */
	do_action( 'bp_before_activity_post_form' ); ?>

	<div id="whats-new-avatar">
		<a href="<?php echo bp_loggedin_user_domain(); ?>">
			<?php bp_loggedin_user_avatar( 'width=' . bp_core_avatar_thumb_width() . '&height=' . bp_core_avatar_thumb_height() ); ?>
		</a>
	</div>

	<p class="activity-greeting"><?php if ( bp_is_group() )
		printf( __( "What's new in %s, %s?", 'buddypress' ), bp_get_group_name(), bp_get_user_firstname( bp_get_loggedin_user_fullname() ) );
	else
		printf( __( "What's new, %s?", 'buddypress' ), bp_get_user_firstname( bp_get_loggedin_user_fullname() ) );
	?>

	<div id="whats-new-content">
	<div id="whats-new-avatar">
		<a href="<?php echo bp_loggedin_user_domain(); ?>">
			<?php bp_loggedin_user_avatar( 'width=' . bp_core_avatar_thumb_width() . '&height=' . bp_core_avatar_thumb_height() ); ?>
		</a>
	</div>
		<div id="whats-new-textarea">
			<label for="whats-new" class="bp-screen-reader-text"><?php _e( 'Post what\'s new', 'buddypress' ); ?></label>
			<textarea class="bp-suggestions" name="whats-new" id="whats-new" cols="50" rows="10"
				<?php if ( bp_is_group() ) : ?>data-suggestions-group-id="<?php echo esc_attr( (int) bp_get_current_group_id() ); ?>" <?php endif; ?>
			><?php if ( isset( $_GET['r'] ) ) : ?>@<?php echo esc_textarea( $_GET['r'] ); ?> <?php endif; ?></textarea>
		</div>

		<div id="whats-new-options">
			<div id="whats-new-submit">
				<input type="submit" name="aw-whats-new-submit" id="aw-whats-new-submit" value="<?php esc_attr_e( 'Post Update', 'buddypress' ); ?>" />
			</div>

			<?php if ( bp_is_active( 'groups' ) && !bp_is_my_profile() && !bp_is_group() ) : ?>

				<div id="whats-new-post-in-box">

					<?php _e( 'Post in', 'buddypress' ); ?>:

					<label for="whats-new-post-in" class="bp-screen-reader-text"><?php _e( 'Post in', 'buddypress' ); ?></label>
					<select id="whats-new-post-in" name="whats-new-post-in">
						<option selected="selected" value="0"><?php _e( 'My Profile', 'buddypress' ); ?></option>

						<?php if ( bp_has_groups( 'user_id=' . bp_loggedin_user_id() . '&type=alphabetical&max=100&per_page=100&populate_extras=0&update_meta_cache=0' ) ) :
							while ( bp_groups() ) : bp_the_group(); ?>

								<option value="<?php bp_group_id(); ?>"><?php bp_group_name(); ?></option>

							<?php endwhile;
						endif; ?>

					</select>
				</div>
				<input type="hidden" id="whats-new-post-object" name="whats-new-post-object" value="groups" />

			<?php elseif ( bp_is_group_activity() ) : ?>

				<input type="hidden" id="whats-new-post-object" name="whats-new-post-object" value="groups" />
				<input type="hidden" id="whats-new-post-in" name="whats-new-post-in" value="<?php bp_group_id(); ?>" />

			<?php endif; ?>

			<?php

			/**
			 * Fires at the end of the activity post form markup.
			 *
			 * @since 1.2.0
			 */
			do_action( 'bp_activity_post_form_options' ); ?>

		</div><!-- #whats-new-options -->
	</div><!-- #whats-new-content -->

	<?php wp_nonce_field( 'post_update', '_wpnonce_post_update' ); ?>
	<?php

	/**
	 * Fires after the activity post form.
	 *
	 * @since 1.2.0
	 */
	do_action( 'bp_after_activity_post_form' ); ?>

</form><!-- #whats-new-form -->

Along with custom css

#buddypress form#whats-new-form #whats-new-avatar {
    display: block !important;
    float: left;
    padding-right: 10px;
}
#buddypress form#whats-new-form p.activity-greeting {
    margin: 10px 0 10px!important;
}
#buddypress form#whats-new-form p.activity-greeting{
float:none!important;
}
#whats-new-textarea {
  float: left;
  width: 90%;
}
#whats-new-form{
overflow:hidden;
}
#whats-new-options{
float:left;
width:100%;
}
@media screen and (max-width:529px){
#whats-new-textarea {
    width: 78%;
}
  #buddypress form#whats-new-form #whats-new-avatar{
  width:auto;
  }
}

It will work.

Regards

Okay great 🙂