Roborock S4 No-Go Zones and Virtual Walls Tutorial
Open your Mi Home app and tap on S4
Tap the... in the top right corner then tap Vacuum Settings and turn on Map Saving.
If Map Saving is already on, you can skip this step.
Return to the Map screen
Tap Edit Map then tap "No Go Zone"
Add a Zone and adjust its size. Move it where you want it.
You can add up to 10 No Go Zones.
Add a Virtual Wall, move it where you want it and adjust its size.
Tap Save in the top right corner.
Tap Clean to start cleanup.