Vendor Styling Options

Hi all,

I'm looking at my site through a vendor's perspective to make sure everything is as it should be.

I'd like vendors to be able to customise their storefront with backgrounds, styles etc however when I enable this option it appears to give the vendors a choice of which theme to use (I have Unitheme installed so there are ~5 options).

I just want to check that changes they make are only for their storefront, and that they won't have the ability to modify general site theme settings?

Help appreciated.