I can't seem to resize windows from the top part of Opera. This becomes problematic as sometimes my windows are taller than my screen which means I have literally no way of resizing them vertically any smaller. How do you make it so you can resize from the top?

I can't seem to resize windows from the top part of Opera. This becomes problematic as sometimes my windows are taller than my screen which means I have literally no way of resizing them vertically any smaller. How do you make it so you can resize from the top?