Need a simpler way to switch `ui.newtab.compactMode` options

What is the feature you'd like to have?
We have a few different ways you can style the New Tab while in Compact Mode (ui.newtab.compactMode). Unfortunately, those don't appear to be exposed (as far as I can tell) in the UI outside of the Settings menu, which is unfortunate for both discoverability and if/when you want to switch between them.

Is your feature request related to a problem?
I wanted to switch one of the modes and it took me a pretty long time to figure out how to switch between them.

Are any alternative solutions acceptable?
As far as I can tell, changing this setting requires a restart. If that's the case, it's possible this ticket can't be solved the way I want. I'm not actually sure what to do in that case, but we should at least mark that setting as restartRequired before closing this.

Additional Information:
If we are continuing our trend of putting toggles for "options that change the content of the current view" in hamburger menus on the top-right of the view, we should maybe consider having this there (and moving the toggle for Compact Mode there as well). Otherwise, putting this in the right-click context is probably fine?

Start by locating the ui.newtab.compactMode setting and the New Tab and Settings UI entry points. Determine whether switching modes can work without a restart; expose the options in an appropriate menu or context menu, or mark the setting restartRequired if runtime switching is not possible.