- You need to have fusuma to make this work. Follow their installation process.
- Add "Minimize All windows" widget to your panel. then right click on it, and choose configure.
- Add the shortcut "Alt+Shift+D" to it.
- Go to System Settings > Global Shortcuts > Kwin. Search for "Switch one desktop to right". Give it "Meta+Ctrl+Right". Do the same for "Switch one desktop to left".
- test it with the command fusuma -c <filepath>