Cmd + Backquote open quick access even if shortcut is map to an other key combination

@gwallet

You mentioned:

redefined the shortcut in system preference: impossible, the shortcut can only be enable or disable

You can change the "Move focus to next window" shortcut for macOS. (I've done this because I'm on a UK keyboard and Command-Backtick is a little bit fiddly for me.) Here's what to do:

1. In System Preferences, open the Keyboard pane, and choose the Shortcuts tab.
2. Click "Keyboard" in the sidebar, then double-click where it says ⌘` next to "Move focus to new window", like this:

You can then set a new keyboard shortcut. Once you've done that, you should be able to change the "Show Quick Access" shortcut in 1Password's Settings.

Give that a try and let me know how you get on.