When editing a login with a TOTP field, the value in that field is exposed. Contrast this with the password field which you have to tap on before it is revealed.
On the Mac app (7.0.BETA-9), this field is protected until selected, like the password field.
1Password Version: 7.0.BETA-5
Extension Version: Not Provided
OS Version: Android 8.1
Sync Type: Not Provided