I show the edit bars:
https://imgbox.com/ASGLxOd8
The red square lower in the picture shows the
cke editor in use. Not that you have to have that specific editor, but that's what I show.
Assuming that you have no custom changes (which should
not be applied to this file anyway), what do you show in your config.inc.php file at line 771?
I would still suggest clearing browser cache and then reload, to ensure no cache-related issues.
From here, we might have to figure out what your settings may be.