How to set default window size?

I would like to set window sizes of programs/prompts on my laptop to fullscreen, but after re-opening the program/prompt after sizing its window, it would go back to its default window size, which isn't fullscreen. How do I set the default windows size so that when all programs/prompts open their windows are at that size? Answer back as soon as possible, and thank you.

I'm not sure about full screen mode. But to automatically setting size, including Maximized, AutoSizer freeware is worth a try.

I have a quirkier way of doing a "full-screen." One at a time, hopefully only once, I place each program window into the upper left corner, barely touching that corner. Taking my mouse, I "pull across and down" until program fills the screen. Almost all programs remember that "full-screen." Be aware that a number of programs do not, will not, keep that setting, many come up with their programmed size, and that's that.