Ver1.2 Fixed the issue of can not cancel the "TopMost" mode: Just uncheck the "TopMost" option at Tray Icon PopupMenu (Screen Bottom-Right corner,near by your WIFI icon) to cancel the "TopMost" mode.
Ver1.2 Released: Fixed the issue of can not cancel the "TopMost" mode
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.