How do I set up a virtual wall?

Open the app > Click on "Map" > then click "Edit Map," and select "Virtual Boundary."
There are two types of Virtual Boundary: No Entry Area and Mop-Only.
When you create a NO ENTRY area (which is denoted by RED rectangle boxes), the DEEBOT will not enter that area or boundary created by you. But in case of MOP ONLY area (which is denoted by YELLOW rectangle boxes), the DEEBOT will not vacuum that area but activate its ONLY MOP feature for that area.