1Password popup menu disappears immediatelly when inviked from toolbar. It's a know issue in other password manager extensions I know. I opened similar ticket in Roboform support.
The behaviour and issue is explained in next URLs.
For Bitwarden is an workaround - Shift + Alt + U opens it menu is sidebar, when issue is only when extension is opened from toolbar.
Good to have same for 1Password.
1Password Version: Not Provided
Extension Version: 1.15.3
OS Version: RHEL 7.6
Sync Type: Not Provided