When you leave the player to browse the library, the 5.0 mini player keeps the video playing in a card in the corner. Find your next video without pausing the current one.

The card shows the title, time and playback controls. Select Expand to return to the player at the same point. A Cast control is also available.
Casting and 10-bit HDR are CnX Pro features, with a free trial on every video. Check the app for the options available to you.
This preview shows the mini player inside CnX’s library. It does not establish an always-on-top window over other Windows applications.