How to disable popup menu on work area

Hi guys. I´m working in a project to transform an Thinc Client station in a kiosk station. For this demand I use the spin LXQt, that had the best performance in my hardware. This new station, need to be accessed by the operators in a factory for imput new dada production in a internal web page, so I need to restrict all funcions, programs and sites in the browser. I already got block to the others web sites, restrict the menu navigation for only access the internet, but I was
like to desable the popoup menu on the work area. Someone have any tip how cam I do it?

I hope you manage to build your kiosk with LXQt.

If not, here’s a Fedora Magazine article describing building a kiosk with Fedora Silverblue and GNOME.