Click "Customize-Customize Wall" and select the wall to enter the customize wall interface. Select the wall and click "Go to Tile Flooring" to enter the Tile Flooring interface. You can select different tile patterns in the "Pattern" on the left and drag them on the wall. Click the material icon in the right property panel to replace the material.
Once the material replacement is complete, you can also select the wall under 3D view in the General design interface and click "Replace Material" to replace the material.
Attention: replacing the material in the general design interface will overwrite the previous wall tiling.