I can't edit Cinemachine "Value" variable in the inspector

I'm using a Cinemachine Free Look camera. Underneath the "Axis Control" header there's a float variable called "Value" which I can only change while in play mode. If I try to change it when the game is not playing, nothing happens. I'll set it to 1 but as soon as I hit enter it goes back to 0.5.

This is not an issue with the project since I've tried making a completely new project, with nothing in it and I still can't edit the "Value" variable.

I've also tried with two versions of Unity,...

I can't edit Cinemachine "Value" variable in the inspector