'Menu Item Fields UI' does not support drupal 10.0.3

Thank you for noticing. I fixed and released a new version.

As for the class there is nothing this module does about the link formatter. Maybe you can try this module:
https://www.drupal.org/project/element_class_formatter →

By reading the description it looks like it might cover your use-case.

Install 'menu_item_fields_ui 8.x-1.7' module lead to the entire website can't open.

😕
Do you see any errors.? I did the commit from my phone but reviewing it now I don't see any mistakes?

Didn't see any error, it is like a broken network can't open it. through composer remove it the website back to normal.

I don't understand what it is that can't be opened.

A button in the interface?
Navigating to the website gives a white screen?

Ok, I finally got time on my laptop to look at this. Indeed enabling the module was creating a WSOD. I released a new version with the fix

Automatically closed - issue fixed for 2 weeks with no activity.