I now see the change theme option moved to the Basic settings.
But changing the level seems to have created a loss of its functionality. Try to change to a different theme, or unchecking the box "Should the web interface use the boxed layout?" toggles the selections on the screen but nothing is changed after hitting "Save and Apply." When refreshing the screen, the original options are still used.
In the file "settings-advanced.js" I noticed a line that referred to the Save & Apply button as at settings level 1 -- div class="col-lg-12 settings-level-1" --. I was wondering if that should be settings level 0 -- div class="col-lg-12 settings-level-0"-- with the change to have the button at level 0.
I think related...I tried to change the web listen port from 8080 to 80 and while the changes are saved and persist, the port is not changed. Should the web server be bounced manually or built in?