Remove power options from menu in Ubuntu 20.04

I am setting up a Lab machine to be used by students, running Ubuntu 20.04. I'd like to remove all power options from the menu, except Switch User and Logout. I followed the instructions in this manual, and added the line disable-restart-buttons=true to the file. Is there something similar for the session?

EDIT: In Ubuntu 16.04 / Unity I managed the same by creating a file named 10_hide_user_list.gschema.override, with the following lines: [com.canonical.indicator.session], suppress-restart-menuitem=true and suppress-shutdown-menuitem=true. I then placed the file in the /usr/share/glib-2.0/schemas/ directory.