Sign in on the phone
Open fantasync.app/app, then Google or email. Cloud sync loads Home and your projects. You will not see a separate mobile workspace.
Add to Home Screen
In iOS Safari or Android Chrome, use Add to Home Screen. Launch from that icon next time. Search still uses Search documents….
What to do in a small window
Check island Tasks and Scheduled. Open a Doc, skim Notes, tick to-dos, leave a comment. Heavy table or draw editing is easier on a larger screen, but it works.