@leocg Is there a way to disable that? Or at least disable the sound it makes? I don't mind it as a loading screen but it is quite a bit louder than the sound profile of other things I use audio for.

So, whenever I start up opera gx, after I restart my PC, the splash screen returns. If I redo the "Splash screen on start up" slider, on-off, and restart opera gx, it doesn't show up.
After I restart the computer it shows up again. But looks like this.