1Password removal sits on Remove > Services
Pull request 15526, merged into quattro, puts 1Password first in Remove > Services. The pull request says removal had only been reachable by typing the script name.
The pull request says Install > Services offers 1Password and the removal script ships, but Remove > Services was built from Dropbox and Tailscale alone. It says the new row is first in that section, shown when the 1Password package is present, and runs the removal script in the floating terminal, like the rows next to it.