Custom Post Type Container, Sidebar Layout same as Blog Post Single.

functions.php

<?php

add_filter( 'astra_get_content_layout', 'custom_post_type_content_layout');
// Update the container layout for Custom Post Type same as Blog Post.
function custom_post_type_content_layout ( $layout ){
	$single_post = astra_get_option( 'single-post-content-layout' );
	// Add your CPT instead of newspaper, book. If it's only for one CPT then add just one CPT.
	if ( is_singular( array( 'newspaper, book') ) ) {
		$layout = $single_post;
	}
	return $layout;
}

add_filter( 'astra_page_layout', 'custom_post_type_page_layout');
// Update the Sidebar layout for Custom Post Type same as Blog Post.
function custom_post_type_page_layout ( $layout ){
	$single_post = astra_get_option( 'single-post-sidebar-layout' );
	// Add your CPT instead of newspaper, book. If it's only for one CPT then add just one CPT.
	if ( is_singular( array( 'newspaper, book') ) ) {
		$layout = $single_post;
	}
	return $layout;
}