Disable wonky touchscreen on HP Spectre x360

I have a Spectre with a touchscreen which inevitably registers phantom touches after running for a while. I've searched this forum and found several "Disable Touchscreen" entries, but none seem to work on my machine.

When I try xinput disable {touch screen id} I get WARNING: running xinput against an Xwayland server. See the xinput man page for details.

I've also tried the method of editing /usr/share/X11/xorg.conf.d/10-evdev.conf to add Option "Ignore" "on" or MatchIsTouchscreen "off" and those don't seem to work either.

Does anyone have any other ideas? Thanks.

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