How do I remove checkered background

Thanks Jmack

RATS:
Stupid comments section DOES NOT ALLOW EDITING, when one needs to edit a comment, so I will>>>

DO IT AGAIN.
Re:
https://community.adobe.com/t5/photoshop-ecosystem-discussions/how-do-i-remove-checkered-background/m-p/14209980#M763518 
(deliberately UNLINKED to allow you to read the next bit):

EDITED:

Try this to revert your NEW paint (3D app), back to your OLD (Win 7 ype) original no frills "paint program"

I found a simple way. (searching for the way to stop video editor opening chimpanzee app (clipchamp)
SETTINGS > Apps > Advanced App Settings > App execution aliases

[ - ] Microsoft ClipChamp (clipchamp.exe) .................................................... (toggle it "off") ....... [ON / OFF]
Bingo - problem solved, Clipchamp will NOT auto turn on, instead you can now "re-see" the older "video editor/s" you used to see..

I found this method, when searching for the OLD (original 40 yr old) MS Paint, without the NEW 3D checkerboard crap.

SETTINGS > Apps > Advanced App Settings > App execution aliases
Right there, under the new MS CHIMPANZEE APP (clipchamp.exe)

Paint (mspaint.exe) & Paint (pbrush.exe) BOTH OF THE TWO NEW PAINT EXE's need to be toggled OFF
When re-installing the original OLD (pre latest "downdates / updates") MS Paint program.
Toggling OFF both new exe's - allows the original win 7 MS Paint program to run, when PAINT is opened.
Without any checkerboard, and without any 3D apps either.

If it works with PAINT to turn the auto-start exe OFF, then Chimpanzees can take a backseat too - by being toggled OFF.

ALSO (someone asked / somewhere in here)
How to NOT SEE the taskbar when taking a full screen screenshot?

When taking a fullscreen screenshot, without the taskbar.
... USE ALT  and the PRNT SCRN button.
ie:
Press Alt + PrtScn. This copies the active window to the clipboard, which you can paste into another program.
It also auto removes the taskbar - as it isn't part of the "current active screen".

Anything else, use the old way of:
Trial and (OMG - I DELETED EVERYTHING) = Error?
If anything is done wrong, it can (generally) be found to still exist somewhere... ?
(& if not, then buying another PC - works for me)