Hi Elise & Artem,
Hope you are doing well…
I wanted to bring an issue to your attention.
We were experiencing a strange issue on the Appearance > Menus page, whereby every time I try to leave this page, the following pop-up message will appear (even if I didn’t make any changes):
“This page is asking you to confirm that you want to leave – data you have entered may not be saved.
Leave Page Stay on Page”
In other words, every time I try to leave this page, it thinks I made changes on the page and a pop-up window appears with the above message. Furthermore, it won’t allow me to leave the page until I click on the “Leave Page” button in the pop-up.
So I deactivated all the plugins and the Basel theme, in order to check for conflicts.
After troubleshooting, it turned out to be the Basel theme that was causing the conflict.
In other words, when I change to a different theme, the problem goes away. But when I activate the Basel theme, the problem reappears.
Here is a screenshot which explains the problem:
https://hnwgallery.com/fireshot-screen-capture-1656-menus-hnwgallery-wordpress-hnwgallery_com_wp-admin_nav-menus_php/
Any help with fixing this would be greatly appreciated!