Good Morning,

I have strange issue, I upgrade Ubuntu to Kubuntu version (on ubuntu everything worked fine), but now I have strange issue, on first connection of my bluetooth headphones (JBL) I have very loud and disturbed sound, after reconnect device, everything is normal. I discovered that the problem is with profile (on first connect it set HSP/HFP profile, and I can manually change this to A2DP profile and sound work great.

So can someone tell me how to set this profile to I have this on each connect?

This is most likely handled by pulseaudio, so the place where this is set should be found in the System Settings > Multimedia or Audio. Not sure you actually can modify the profile settings (yet), I am not sure this is already implemented, but if not, it certainly should be.