I am a new user of Strawberry Music Player, running the flatpak app version 1.0.9 on Ubuntu 18.04 LTS.

By experimenting, I have learned that:
Each displayed "playlist" has its own queue.
There is also a "currently selected playlist". If you have several playlists open, each one is represented by a labelled "tab" in the right hand side of the window.
If you close tabs until only one playlist remains, the label of the playlist appears to be no longer visible. (That puzzles me.)

When you select a track in the currently selected playlist and performs "queue track" (from the right-click menu), that track will be added at the end of the queue associated with that playlist.
If you choose a different playlist, the displayed queue will change to that associated with the new current playlist. You can use this to see that the queues have different contents.

But at this point I am stuck, leading to the following questions:
What does it mean to have more than one queue?
How do I start playing from a queue?
Is there some MAIN queue which in some way serves the multiple queues? If so, how to display and control the main queue?

I have tried to find explanations for the above questions in the forum and in the wiki, but so far not found anything, and so is hoping for help from the community.

Best Regards,
Peter Olsen, Denmark.