How to resize a window that goes beyond the bottom of the screen?

[mahesh]

Ubuntu 20.04 LTS using Unity Desktop

How to resize a window that goes beyond the bottom of the screen?
Do I hold down a key, on keyboard, when attempting to do so?
I need to see what's on the bottom of a window, but the bottom of the window exceeds the screen size and I can't grab it down there to resize it up a bit.

(?) Help please....