How Do I Clear an Old Genre?

When I change from say Jazz to Country, why does the Jazz album continue ? I have clicked on the Country but it seems the Jazz must finish first.

One of the great things about Roon is that you can browse through the database, while listening to a track, album or playlist quite separate from what you are looking at.

What you are listening to is determined by the playlist. If you want to play a track, album that you are browsing you can left click on it and click play track or play album, or right click to select it and click Play at the top. If you want to play a genre then left click, play genre. With tracks or albums you have a choice between playing them immediately (which clears the current playlist) or adding them to the existing playlist.