Show 120 items on WP admin screens instead of the default 20

more-admin-screen-items.php

<?php

namespace AdminScreenItems;

add_action( 'admin_init', __NAMESPACE__ . '\register_admin_screen_items_callback' );

/**
 * Register set_minimum_number_admin_screen_items to all admin screens.
 *
 * It's necessary to manually add it for each screen name because WP_Screen::render_per_page_options
 * doesn't have a generic filter.
 */
function register_admin_screen_items_callback() {
	$core_screens = [
		'edit_comments',
		'upload',
		'users',
		'plugins',
		'themes',
		'edit_tags',
		'export_personal_data_requests',
		'remove_personal_data_requests',
		'sites_network',
		'users_network',
		'site_users_network',
		'plugins_network',
		'themes_network',
		'site_themes_network',
		'comments',
		'edit_categories',
	];

	$post_types        = get_post_types( [], 'names' );
	$taxonomies        = get_taxonomies( [], 'names' );
	$post_type_screens = array_map( fn( $post_type ) => "edit_{$post_type}", $post_types );
	$taxonomy_screens  = array_map( fn( $taxonomy ) => "edit_{$taxonomy}", $taxonomies );
	$screen_hooks      = array_merge( $core_screens, $post_type_screens, $taxonomy_screens );

	foreach ( $screen_hooks as $hook ) {
		add_filter( "get_user_option_{$hook}_per_page", __NAMESPACE__ . '\set_minimum_number_admin_screen_items' );
	}
}

/**
 * Admin screens should always show at least 120 items on each page.
 */
function set_minimum_number_admin_screen_items( $result ) {
	return max( 120, (int) $result );
}