Bluetooth headphones work only partially?

I use my Bluetooth headphones for my laptop (Windows 10) and they connect well and I can watch YouTube while I hear with them. However, in FL Studio 20 I can't hear the music with my headphones. They are from Panasonic (RP-NJ310B)

When I select the headphones for audio the sound is very bad and you can barely hear it. How can I change this? So far I could only select the ASIO 4 All for clear sound. But this is not reflected in my headphones but by PC.

Make sure you connect the headphones before starting the game and set them as the "default device" in the sound settings.

Also check that the volume on the headphones, in Windows and in the game are screwed up