Hiya, that option is available for AFG+ users. Though, you can try zooming in your screen, it affects some games. Though that's all I can say on my knowledge about this topic.
AFG+ is short for Ad-Free Gaming+, which is something users can buy for the following benefits:
- No ads.
- Full Screen and Turn Off the Lights options on game pages.
- Gold coins with king heads in the forums (normally, the coins are blue and have a Sushi Cat for heads).
- Access to a secret forum.
Knights, Mods, and Admins get AFG+ for free, and there will occasionally be contests that award AFG+ to the winner.