[dleslie]

Steam's presence API only supports one playing device at a time. It wouldn't be able to understand multiple active playing games on one account.

[squeaky-clean]

So it claims, but many games let you click X on that dialog and play other games. I have an old laptop which is basically a dedicated Civ 6 machine. I can still play any other steam game on my desktop while the laptop has Civ open.

[dleslie]

Many games on Steam can run without access to Steam. When you close that dialog you're denying the game access to the Steam API.