You will need to either create a custom window for the side windows or you could try searching for and downloading the 'Polygonal Window' object.
I have no idea if that will work but it will allow you to adjust the shape of the window.
Creating your own custom window is fine but the shape is fixed.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11