I wanted to create a spiral rotating at constant speed. I created my spiral, made two keyframes with linear interpolation and then wanted to add linear extrapolation, but for some reason, when I right click on the channel in graph editor, all the options under extrapolation are greyed out. I am not sure, whether this is just blender 2.8 thing, or I just made some stupid mistake or overlooked something... What could be the cause of this? Or is there some workaround or something? Thanks in advance.