Can I turn off features I don't use?

No. Individual features can't be switched off or hidden in VirtualCallboard or StageStock. Every site on a product has the same feature set, even if you never use some of it.

What each person sees is shaped by their role, so people only get the menus and buttons their role allows. A StageStock plan can also be turned off entirely if you only need VirtualCallboard, under Invoices/Payments > Change Subscription Package.