Hi @dancremeans – thanks for the question! Everything you play in Roon goes into the Queue, which you can access by clicking along the bottom part of the app (where we show the currently playing track).
If you click Play Album the whole album will be added to the queue. If you click a single song, or select a few songs by right-clicking them, they will be added to the queue as well. This makes it easy to queue up a few albums or songs without creating a playlist.
If you have Roon’s Automatically Start Radio feature turned on, similar songs will start playing whenever the selections in your queue run out. You can turn this feature off if you’d like, but right now we don’t automatically add the rest of an album to the queue when you play a single song.
A number of users have asked for “play from here” type functionality – meaning, more like an iPod than a jukebox. We’re considering some changes for the future, but for now you can read the discussion here.