This one is documented on https://support.1password.com/keyboard-shortcuts/#:%7E:text=*%20To%20customize%20these%20keyboard%20shortcuts%2C%20right%2Dclick%20the%201Password%20icon%20in%20your%20browser%27s%20toolbar%20and%20choose%20Settings%2C%20then%20scroll%20down%20to%20the%20Shortcuts%20section.
To quote:
To customize these keyboard shortcuts, right-click the 1Password icon in your browser's toolbar and choose Settings, then scroll down to the Shortcuts section.
The advice worked great, I changed mine already and happy with it.