As discussed in the 5/20/20 meeting, one perennial feature request for jlab has been a mode that looks and feels exactly the same as notebook classic. Some people don't like the filebrowser, or the side bars, or anything that pulls focus from a single notebook experience, etc. More broadly, there's a huge swath of classic notebook users who currently haven't migrated to jlab but might do so if the UI/UX was basically identical.

There are a number of different ways we could implement such a thing. Some basic sketches:

1. Hide everything except a single widget (which could be a notebook document widget or anything else) and maybe the menu bar
2. 1-to-1 emulation of classic notebook, but built using jlab api

Some things to consider:

1. What should we name this mode? Notebook classic-ish?
2. Should there be a separate launch command for this mode?
3. Should there be a separate url?
4. Should the user be able to dynamically switch into/out of this mode?

pinging @ellisonbg @afshin @jasongrout @vidartf @ajbozarth @lucbouchard1 @nproctor @declanvk