You can disconnect your properties from all or specific sales channels in RU. You can disconnect a property from ALL sales channels via Properties > Disconnect
If you just want to disconnect a property from certain channels, you do that in Services > My Services > Channels.
Disconnecting a property in Rentals United will however not delete the property completely from the sales channel. Please contact the channel directly and ask them to remove your listing. You can find more information about how to disconnect from a specific channel in the section How it Works > Step 4, inside each sales channel