half screen

Hi
Why when I open my edge browser it always half screed?
Thank you

It will remain at the size you last left it.

I have found this happens to me if I close a window while it is snapped to any position on the screen.
If your windows is half screen top to bottom position your cursor on the bottom edge of the window until it becomes a double-ended arrow. Drag it to down to resize the window (if it's half screen left to right, put cursor on the side edge of window and drag) Windows should remember this new size and open that way the next time you open Edge.