Changed Intersection Function

If you migrate an older-version project to ARCHICAD 20, the Legacy Mode for element intersections is turned on by default to maintain the appearance of your model. This means that you will not see any changes in your element intersections.
Note: When you create a new file from the template, this legacy checkbox is off by default and the new intersections method is enabled.
Legacy Mode is controlled in Options > Project Preferences > Legacy.