Wait while the checks below run, about a minute. The results save themselves.
Then install this page: Chrome's ⋮ menu, then Install app (or "Add to Home screen").
Checking…
Checks
Rules: running…
Reminder trial
Test reminders come from the "Tracker" calendar in your Google Calendar app, at 11:00 AM and 10:30 PM your time. On a day you'd like the rest of that day's reminders cancelled, tap: