How do I connect a door to a window in a floor plan in ArchiCAD 28

[Alexc]

I have a door and a window connected like this in my study project and I need to get rid of the line between them (on the screenshot it's circled with a red line for clarity). Unfortunately, I don't remember how to do it, and I need help with that, because I know for sure there is a way, I just forgot it.

Operating system used: Windows CZ EDU

[BrunoH · Accepted solution]