One of the best features of Xbox Series X and Series S is Quick Resume, which holds games in a sort of "suspended state" so that players can jump back in at a moment's notice.
However, as you may have noticed on launch day, the system isn't flawless. For one, many apps simply close because they don't support it.
For another, there's no way of telling which apps are ready to be resumed.
Microsoft's support page has the following to say:
"While Quick Resume is fully operational with thousands of titles, we are aware a select number of Optimized titles may be experiencing issues with this feature."
"To ensure the best possible experience for our fans, we’ve disabled the feature for these titles and are working as quickly as possible to fix this at the platform level."
Xbox Series X and Series S: How To Use Quick Resume
The good news is that it's remarkably easy to toggle between games when Quick Resume does work.
All you need to do is jump from one game to another, either by pressing the Xbox button and going home, before selecting another title, or by going via recently played titles in the Guide itself.
If the game you've chosen is being resumed quickly, you'll see a logo in the top right that says "Quick Resume".
In our testing, we've found it's the optimised titles that need a fix, while I was able to jump between Xbox One, Xbox 360 and even original Xbox titles with relative ease.
Here's hoping Microsoft can push out a feature soon.