Hello,
The GPO policy you are looking for is:
Computer Configuration>>Administrative Templates>>System>>Power Management>>Sleep Settings:
"Require a password when a computer wakes (on battery)" set to "Disabled"
"Require a password when a computer wakes (Plugged in)" set to "Disabled"
Both of these need to be set to disabled to prevent need for a password. (this spare your kiosk from screen burn.)
To have it never time out set the following GPO as well:
Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >>
"Interactive logon: Machine inactivity limit" set to "0". This will prevent the device from timing out and locking.
If these settings help please upvote and accept this answer.
Thank you and have a great day!