I have bought saints and sinners on my oculus quest 2 but also have a oculus link cable. Can I play saints and sinners with my PCs power if I bought it on my quest 2 or would I have to buy it again on steam? I want to do this so I can play saints and sinners with better graphic quality and get more immersed bt I don't really want to buy the game again on steam just to upgrade the graphics
You won't be able to do this with saints and sinners but some games do support it. When you purchase a game through the oculus store check under the comfort rating for compatibility. If it says the game supports both oculus quest and oculus rift then you can play it on either the quest standalone or on the PC via link through the oculus app.
Saints and sinners is a cross buy title so you can install the desktop version using the oculus application. (Can't remember if it'll automatically show in your library of if you'll need to find it in the store)
A list of cross buy titles can be found here: https://www.oculus.com/experiences/quest/section/2335732183153590/?locale=en_GB#/?_k=vro3h2