It's really driving me nuts, and I'm very disappointed.
I clicked on the big question mark. Nothing happened.
The website icons haven't returned, they're just generic.
There is often a delayed reaction when I click on something. Not that it's slow to respond, it just doesn't indicate that it's doing anything. The cursor doesn't change from the arrow to Mickey's glove, the virtual button doesn't look selected, and then the beachball shows up.

Thank you for your information. I'm not afraid of Terminal. I don't know what it is