Can anyone tell me which checkbox I might have pressed unintentionally?

[MaxCasey]

Hello, I have a brief question. Yesterday, the aim window on my desktop disappeared after approximately a minute. However, the audio continued to play, and the window returned when I clicked the AIMP button on the taskbar. I couldn't find the checkbox that may have been accidentally pressed, so I decided to resolve the issue by restoring an image from a few days ago, and it worked. Can anyone tell me which checkbox I might have pressed unintentionally? I'm using version 5.02, build 2370, and Windows 11. Thank you for taking the time to read this, and I hope to receive an answer.

[Алексей Долматов]

Minimized to the notification area (tray)? RMB/LMB different folding actions.