Hi all,
Help would be greatly appreciated.
1. When I view site settings now I can see a bunch of icons on the top and side. Screenshot attached. Is there any way to change it back to normal view.

2. I have full control of the site but suddenly I cannot access some site contents such as Site Assets, Style Library, Site Pages. I get Something went wrong error.
It used to work fine with no problem.
Any suggestions would be greatly appreciated.
