Hello Syam,
for sure the menu editor is enabled!
Display Deprecated Capabilities: Off (unchecked)
Remove Non-Standard Capabilities on Restore: Off (unchecked)
Override Edit Permissions: On (Checked) (here I tried both, nothing solves the problem)
Disable Navigation Menu Permissions: Off (unchecked)
Override Navigation Menu Permissions: Off (unchecked)
Customize Permissions (custom post types): All on checked
Disable Extended Permissions (post types): All off (unchecked)
Remove Data on Uninstall: Off (unchecked)
The editing of the menu is also possible without further ado – however, there seem to be problems with the permissions.
Please read my description carefully, it describes everything in detail!
Even if I really activate EVERYTHING for a role, I can’t edit the standard WordPress types (pages and posts) or Custom Post Types, because I always have to deal with the aforementioned errors.