
This problem happens sometimes when Edge gets stuck to the side of the screen, many people report this.
1
Open Edge.
then on your taskbar, hover your mouse over the Edge icon.
When the Edge thumbnail appears, right click the thumbnail and select Maximize, to see if that gets the Edge window appearing correctly on your screen.
2
If not, close Edge, open the Settings App, then go to Apps - Installed apps.
Scroll down to find Edge, then select it and choose Modify - Repair
3
If that process also does not solve the problem, download the Edge installer from this link and re-install Edge on top of itself, because Edge cannot be uninstalled.