Just noticed this happening today. If I try to go to the Typography section the page freezes and it won’t let me do anything. The fan on my laptop also spins up loud. I have tried another PC but still the same issue.
Weirdly when I tried the second time all of my customisations had gone so the fonts were still there but no selections. I added body selection and header selection but now it’s freezing again.
It’s a plugin that’s causing it but that’s weird as I’ve not added any new ones for a while. If I deactivate them all it works so I’ll go through (on Monday!) and see which one is conflicting.
It was the Gutenberg plugin. I have no idea why I have it installed tbh, as it’s not needed? Don’t think it’s even recommended to use in a live environment.
If you have that activated, deactivate it and try again.
yeah don’t use the Gutenberg plugin on a live site.
That plugin is in constant Beta version, and is for developers to check out new features, but it also comes with a lot of bugs.