How to Hide All Normal Windows on OpenSUSE?

Here is the trick to show desktop / hide all normal windows on OpenSUSE:

1. go to Settings.
2. search for Keyboard.
3. Move to tab "shortcuts"
4. Go to Navigation
5. Scroll down to find "Hide All Normal Windows".
6. Click on the right side (you will see New Accelerator or something)
7. press windows + D (also called Super + D)
8. Now on the right side it shows "Super + D"

Finally you're done. Press Super + D to see desktop.