Keep Screen On

Keep Screen On allows you to add a quick settings tile, with which you can easily disable screen timeout and then restore the previous timeout value.

For example, this may be useful to you if you need the display to stay on temporarily when viewing a website or document or if your device does not have the option to set the screen timeout to never in the settings.

Features:
• Disable screen timeout or set a specific value
• Quick settings tile
• Automatically restore timeout when battery is low
• Automatically restore timeout when is screen is turned off
• Material You
• No creepy ads or trackers
• No internet permission
• Open Source

Source code: https://github.com/elastic-rock/KeepScreenOn