It just might have been minimised to a point where you can't hit the "maximise" setting or pull it bigger.
With Edge open (albeit only just ;-) ) try right-clicking on a blank area of the taskbar at the bottom of the screen, and select "cascade windows".
Under normal circumstances, this presents all the windows you have open at a set (somewhat minimised) size, and you can then select the window you want.
If it presents the Edge window in this manner, try selecting it, and then maximising it with the symbol top right.
If you get this far, and it does maximise, there is a chance Windows will open it maximised at next invocation.
Far from guaranteed to work, but easy to check.
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