Hello @senvas,
Thanks for writing in! A loading screen would probably because you have exhausted your PHP memory limit. By default, WordPress will attempt to increase memory allocated to PHP to 40MB (code is at the beginning of /wp-includes/default-constants.php) for single site and 64MB for multisite, so the setting in wp-config.php should reflect something higher than 40MB or 64MB depending on your setup.
We recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
And if this does not work for you, please provide us access to your site in a secure note so that we can take a closer look. To know how to create a secure note, please check this out: https://theme.co/apex/forum/t/how-to-get-support/288
Thanks.