Look in your download folder but Edge have been signaled as not returning the wallet files…
If you don’t have the .wlt file and no private key, there is no way to retrieve your account… Sorry
On the dashboard it is written that you must make backup of your private key and ensure your account is safe when using Main network…
You must never send funds on an account before being sure everything is backed-up.
MS Edge as well as MS IE are not supported (like a tons of other applications) because they are bad browsers for numerous reasons.
New version of the application will lock if using any of those browsers to prevent this kind of issues.