OK. In the event of you wanting to restore/reinstall, or whatever. You should, in the first instance, make a copy of the folde. It's here:
C:\Users\username\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\AC\MicrosoftEdge\User\Default\Favorites
In their usual contrary way, MS chose to bury it real deep