Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
If you enable this policy, users will see a prompt to import their browsing data from other browsers on each Microsoft Edge launch. If you disable this policy, users will never see a prompt to import their browsing data from other browsers on each Microsoft Edge launch. If the policy is left unconfigured, users can activate this feature from a Microsoft Edge prompt or from the Settings page. Note: A similar policy named 'AutoImportAtFirstRun' (Automatically import another browser's data and settings at first run) exists. This policy should be used if you want to import supported data from other browsers only once while setting up your device.