Bulk Property Modification

To change the properties of multiple elements on a floor at once:

Select the elements whose properties you want to change.

You can select elements by left-clicking on them with the mouse, or by framing elements with the left mouse button, or by using the "Select all" option from the right-click menu, or by using the "All" option button at the top right of the modeling screen.

Hover over one of the elements you want to modify and press the right mouse button. (For example, right-click on a wall)

Click the "Change selected element properties" option. (For example, "Change selected wall properties")

In the window that opens, enter the new value in the property field you want to change.