Setting up a touch screen

Hello
I am trying to set up a cheap touch screen monitor so I can run Lcnc without a mouse and keyboard. The touch screen seems to work well. I have installed 'onboard' as a virtual keyboard, which allows me to log in via the touch screen, but once the os is fully loaded it won't let me type into any text box at all.  I am running Debian Bookworm, with a default xfc session and Lcnc is version2.9.8. 
Any help gratefully received.
Thanx

Keep a wireless mouse and keyboard connected to use for configuration purposes but put them on a cupboard until needed.
Use a GUI like QTdragon that is designed to be a fully touch enabled GUI.

Thanks for your reply. Problem is, I want to be able to use a virtual keyboard, and onboard just does not work. Could it have something to do with the window manager? Others seem to be available in the boot menu, but when I try them they come up with an error. This is a fresh install.

What error?

On the top Right menu of the boot screen I have options for: 
Default Xsession
Gnome classic on Xorg
Gnome Classic
Gnome on wayland
Xfce Session
Only the Default Xsession and the Xfce session works. The others give me a white screen that says "Oh no. Something has gone wrong and the system cannot recover. Please log out and try again". There is also a sweet little icon of a computer screen and a sad face. Much of the googling I have done suggests that onboard only works with a few window managers.
Thanks again

Which interface for linuxcnc u using?

The Default Axis?