Can you try Alt+F2 and type dconf-editor? If that doesn’t work, sudo apt install dconf-tools in terminal and again try the Alt+F2 and type dconf-editor.
In the new window, navigate to /org/gnome/shell/extensions/zorin-connect and toggle the ‘enabled’ button. Then close this window and see if that disabled it.
If that doesn’t disable it for you, uninstall the package completely (Synaptic or sudo apt purge zorin-connect). Although, with this approach I don’t know if there are unintended consequences.