Animation Editor, bodyparts unmovable

I really do like the Animation editor, they keep it simple and it’s easy to use and you don’t have to import export and stuff. Though many annoying things keep happening. I want to animate something, but i am unable to move bodyparts. They are outlined with a blue border and there is the letter “L” on them, see here:
image

I tried:

  • Searching forum articles and researching online in general
  • Pressing CTRL + L to remove the L on the bodypart which doesn’t do anything in my view.
  • Pressing R to switch the moving mode

I just don’t like to restart studio or something every time something glitches out or anything. I am searching for answers