If you are in the Navigation window and you click the left mouse button over a tile, PropertyGrid allows you to check which item has been applied in the selected strip.
You can also change the grout value, the height of the strip, the parameters of the material assigned to that tile, etc...
The same can be done selecting the floor: here you can check item details, and also change the grout and rotation value.
This article is valid for DomuS3D® 2018 and later versions