[With Linux Mint]

If a song is playing when I click the x at the top right of the window, recently Spotify has continued to play the music, even though the program isn't to be found on in the tabs. After opening System Monitor, I see four tabs open, one of which taking up a significant amount of resources, and was curious if anyone could help me out there.



Also: Considerably new to Linux, so please explain as simply as possible with steps said without presumptions of my understanding.

-Always entirely grateful for the help, the Linux community, and additional tips along the way; hoping to recommend it to many as soon as I get a handle on it myself. Thanks again, folks

Attached Thumbnails

 

were you able to end that process with system monitor?

if not you might need to close it with "kill PID" command from terminal.

I can "End" or "Kill" the process by right-clicking it in system monitor,
but it gives me the message provided.

About similar to any Windows prompt, but I'm relatively new to Linux;
will it cause any permanent damage or erase saved playlists?

""kill PID" command from terminal."

If so, how would I could go about doing that?

-Serious appreciation

Attached Thumbnails

 

And it might kill your cat and cause a meteor strike. Purely scare mongering message.

If a program is sufficiently badly written it can't even close its own threads cleanly, it's possible it could corrupt its own data (playlists say) when killed. Extraordinarily unlikely, but cats do die too.
My attitude is kill it (the process, not the cat) and be damned. Never had a subsequent problem.

In the screenshot you provided the PID is 30782. In a terminal you do
If you don't have the PID(s) handy on a terminal do
It will give you a list of the spotify-processes including the PID(s).

HTH .