Hi,
I have some CSS which are not applied anymore after upgrading a site to J4 (on my dev server - the production site is still under J3).
That's the display before the upgrade

The display after the upgrade

The CSS for the text display and for fontawesome are not applied anymore, don't know why
I have also a SP Builder menu in the backend which is not supposed to be there and doesn't wwork anyway:

Can you tell me what's going on and how to fix?
Sandra