I pretty certain it is located here AND is called "spartan.edb" which is a database file.
C:\Users\YourUserName\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\AC\MicrosoftEdge\User\Default\DataStore\Data\nouser1\120712-0049\DBStore
There is no practical means or method to edit this file within Windows 10 or Microsoft Edge natively except the normal nominal moving, deleting and renaming.
I use a third party program which I've found particularly useful for bulk tasks like cleaning up the ugly "Imported from" folder and placing its' contents normally under the root "favorites" heading as well as bulk sorting and other such tasks.
www.edgemanage.emmet-gray.com
NOTE: I'm not endorsing or otherwise suggesting that this is a tool you will find, works for you as I have no idea what your intentions are, I'm simply passing along something that I've found useful.
ALSO: Once you have made any changes you should be aware that you need to use the "File" menu item from the toolbar to "Save" those changes.