Method 1. If it is a finished tile/material. Please click on the floor/wall, and click on the floor/wall, then click Clear Material on the upper toolbar;

Solution 2. In the custom tiling interface, click the tile with the left mouse button - press the Delete key on the keyboard to delete the tile; If you need to delete the tiles of the entire wall, you can right-click on the wall in 3D - select Remove Tiling.