Can't Left Click to move Fader

Hi Everyone,

I’m trying out Cubase right now with the intention of moving from Logic.
I’ve come across an issue tonight, its probably a small thing I toggled when while trying things out:

I can’t move faders, add sends or change routing, etc on any channels with the left click of my mouse. I have to hold option/alt to allow the left click to work.

Thoughts??? Any help is much appreciated.