Locking the Pane Width or Hight

Hi there… just wondering… is there a way to lock the height or width of a pane in Blender?
For example, I lock the height of the time slider to my liking, then if I adjust some other pane… it doesn’t resize? If not… it would be a great feature to be able to lock the x, and y shape of a pane if you absolutely don’t want it to change. No?
M