I'll keep it short. I'm too lazy to explain.

Step 1: Go to Microsoft Store and Download "Lively Wallpaper"

Step 2: Select any live wallpaper on "lively wallpaper app". I chose Maxtrix Rain xD

Step 3: Now look at the Lively wallpaper app in the "top right corner" then click the monitor like icon with number 1 on it.
You'll know you clicked the right icon if it shows you "choose display".
After that pick selected screen only.
Then Ok.

Step 4: Next, Close the lively wallpaper app. also close it in the taskbar icons. LIKE FULL EXIT.

Step 5: Open Wallpaper Alive on steam, select wallpaper from workshop, THEN DONE.

Step 6: DONEEE. IT'S DONE. SHOULD HAVE ANY ERRORS OR DIDN'T WORK. RESTART PC AND TRY AGAIN. IF STILL NOT, GIVE UP XDD JK