In the last 7 days two new users have experienced the same issue when I was setting them up with LegendApp.
Here is the flow of the user experience.
Install the Legend desktop app on a Mac.
Sign in with Google.
And then go to Settings, Calendar or Contacts or Drive.
⚠️ The Google set up option is not there, there are three animated dots. It stays that way
I have the user try to quit and start Legend again, issue is still there
⚠️ Then the entire UI locks when we try to force quit and start it again.
In once case restarting again fixed it, in another, switching to beta and coming back fixed it.
The main takeaway is that quickly adding a Google Calendar sync right after you register has issues. This has been seen three times in the past. Including these two. The next issue is this weird UI is locked, but the view file, window, and developer tools are accessible. I have only seen it on Electron so far, but it is possible this will also happen on the browser.