I could not get the Control Button to work on my Toshiba with UHD screen (3840x2160). I set the screen to 1920x1080 and the Control Button started working. Just an FYI.
Curt
Thanks for letting us know, I’ve made a task so we can get it fixed: https://code.alephobjects.com/T389
There’s a way to fix this (temporarily)
copy the original cura-lulzbot.desktop file:
~]$ cp /usr/share/applications/cura-lulzbot.desktop ~/.local/share/applications/.
edit the file so the exec file reads the following:
Exec=env GDK_SCALE=1 cura-lulzbot
instead of this:
Exec=cura-lulzbot
You can set the GDK_SCALE to something which matches your HiDPI setup.