Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
This policy gives an option to hide the "Restore pages" dialog after Microsoft Edge has crashed. The "Restore pages" dialog gives users the option to restore the pages that were previously open before Microsoft Edge crashed. If you enable this policy, the "Restore pages" dialog will not be shown. In the event of a crash, Microsoft Edge will not restore previous tabs and will start the session with a new tab page. If you disable or don't set this policy, the "Restore pages" dialog will be shown. If you set this policy, do not set the 'ClearBrowsingDataOnExit' (Clear browsing data when Microsoft Edge closes) or 'SavingBrowserHistoryDisabled' (Disable saving browser history) policy since that prevents history from being saved which also disables the dialog.