So after a long while using mate desktop environment, I decided to install plasma and see how has kde been doing in all these years.

The problem is plasma is loading blueman-applet, when it shouldn't, cause its got its own bluetooth tool. Bluetooth is working fine in both plasma and mate, its not a bluetooth issue.

I just don't want to have to unload blueman-applet everytime I load plasma.

Uninstalling blueman-applet wouldn't be proper, cause it is necessary for mate. I'd like to keep both DE´s.

How do I tell plasma to NOT load blueman-applet? Any ideas?

This is a lenovo notebook running debian bookworm. Plasma version is 5.27.5. MATE is 1.26.

You can try looking in System-Settings>Startup and Shutdown. In the Autostart section, see if it's listed there and, if so, disable it. Also, check the Background Services section and if it's listed there disable it. Finally, in the Desktop Session section, under "When logging in" select the "Start with an empty session" option. The key here is to figure out what's loading the blueman applet and the foregoing are the first places I'd look.

I'trd really help us if the OP would provide us with the pertinent logs. This can either be done with a paste service like paste bin.com or just use the CODE tags feature right on the LQ reply pane.

you can find most of the pertinent log files in the /var/log file system.

In particular the blues-man software package would most likely be in.

/var/log/bluez-man

If someone is affected by the same issue, here's the fix:
https://bbs.archlinux.org/viewtopic.php?id=210844

tough for arch linux, works fine in debian bookworm.