Modern double glazed windows are easy enough to close with the pole. I just use the back of the brush head to push close, as they are not held open.
Older windows are a different matter as they are held open. It just takes careful control & accuracy. I have never had any complaints (better not get one Monday now) The smaller top opening window can be kept open as it doesn't drip onto the lower part of the frame/window, so actually helps make the job easier & quicker.
Hope that helps. Welcome to Next Generation of Window Cleaning.