Is it possible to customize the 'contextual single' interface?

I have been customizing menus, and for the default interface, it works fine.
I thought the ‘contextual single’ interface looked good, so I switched to it, but none of the menus I customize seem to change anything about it.
Are its menus in the customize window somewhere?

Edit: Its toolbar seems to be in the Notebookbar tab, but changing which commands are displayed and hitting ok doesn’t change it; I select for ‘redo’ to be a visible command, but I hit ‘ok’ and it doesn’t work. When I come back into the customize menu, it is unchecked again. The only choice under ‘scope’ is ‘libreoffice writer - none’. Maybe that has something to do with it.

I don’t seem to be able to edit the post anymore. I will assume this is a bug then, since checking or unchecking the buttons in the customize menu doesn’t actually update your preference.