Getting started

Read the overview first: switching on catalog mode does not change what shoppers see yet.

Open Settings → Modules, find Catalog Store and click Enable.
Open Vendors → Network → Catalog Mode.
Use the switch next to a seller to put them in catalog mode. Use the All / Only catalog-mode filter to see who is in it.

Sellers can switch it themselves in their seller panel under Settings → Catalog Mode.

If a seller must not take orders through your store, use what works today instead:

Hide or disable their products, or
set their products' When price is zero to Ask for quote and set the price to 0, or
put the seller on hold in Vendors → Vendors.