How to mass delete in Lumion?
Just hold the Ctrl key down and move over the objects you wish to delete. The objects should be of same type for this method to work. For example, you cannot delete trees and human at the same time.
Download Lumion software here: https://support.lumion.com/hc/en-us/a...
I am using a student license for Lumion Pro 12.3.1 through my university affiliation.
Good luck!
Arghavan