Is it possible to completely disable all Gmail synchronization, without actually logging out of the account?
The use case is a phone for a senior who does not read email on the phone. For senior reasons the phone is set with no passcode to unlock. As it stands now I've set the sync to the minimum possible (1 day if I recall), but there's still the ability to search for and find private email messages. There are potential nosy persons with access to the phone.
See also Logout from Gmail account without logging out Google Play Store account and How can I set up my Google account without syncing Gmail?
And as everyone should know: anyone with access to a phone can reset the password on almost any online service account. A few banks are smarter than that, but not all of them.