Older games tend not to have these graphical enhancements, so at that point feel free to go to Gaming > Games, pick a DX9-based game, then click ‘Advanced’ to see all the graphics settings you can change.
Most of these only apply to older DirectX 9 games however, so there’s no point messing with them for more modern games (which tend to have those options in the in-game settings). Radeon Settings lets you change graphics on a by-game basis, adding features like anti-aliasing, texture filtering and other graphical improvements. You can also press Ctrl + Shift + R to start and stop recording your gameplay. This is also where you make sure that Instant Replay is actually enabled.
Click the Settings cog > General, and you can change instant replay duration, or even save it as a GIF instead.
Using Ctrl + Shift + S, you can instantly record your last minute of gameplay, letting you immortalise those gaming memories worthy of your hall of fame. You can’t plan for those moments of glory where you shoot your way out of a 3-on-1 situation in a Battle Royale game, or when that open-world RPG you’re playing glitches out in unthinkable and hilarious ways.