Maybe a printed snap-on cover with some clear plexi cut to shape to fit in the holder.
If it fits tightly where it can’t just be lifted away, it could prevent fingers from actuating front panel controls but still let people see the display.
There are so many X1 screen cover models on MakerWorld too.
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The closest solution I know of is the Screen Lock available with X1Plus. You can set a numerical unlock code, but it does disable the display completely.
On a slightly related note, the H2D has a “safety key” on the rear that can be removed to disable the printer.