Thanks for the quick reply, Frank. I had already had a look there, and (correct me if I'm wrong) it seems to be implying that the only way is via an "Enhance" adjustment brick - there is no quick brush that you can do directly from the tools on the top of the screen if you're working in Full Screen mode?
there is no quick brush that you can do directly from the tools on the top of the screen if you're working in Full Screen mode?
In addition to the "Enhance" sliders that Frank pointed to, I see the "Saturation" in the "Brushes" Drop-down in Full-screen mode.
Only you have to set the amount of saturation first to a low value using the slider in the "Saturation" brick of the adjustment panel.
You may have to add the "Saturation" brick first to the "Adjustment" tab from "Add Adjustment > Quick Brushes > Saturation"
To add a "Saturation" brick permanently to your adjustments click the cogwheel in the Saturation brick and enable "Add to Default Set".
You can also save the setting - with the adjustment slider positioned as you want it - as an Effect:
Effects > Save as an effect.