The isolated environment prevents the legacy site from accessing modern credentials or cookies from your other tabs. This is an XML file that acts as a rulebook, telling Edge which domains require IE mode and how to handle them.
IE Mode Edge Enterprise Deployment: Configuring Site Rules and Security
This isolation ensures that old code does not compromise the stability or performance of the modern Chromium foundation. You can then add the URL of the legacy site to the "Allow" list, which prompts the browser to load it correctly the next time you visit.
Microsoft provides the Enterprise Mode Site List Manager tool to create and validate this file, ensuring the configuration adheres to the intended security and operational standards. Furthermore, you can manage these settings through the "Security and services" section in Edge.
IE Mode Edge Enterprise Deployment Guide
This technology allows Edge to seamlessly launch a dedicated instance of the legacy engine for specific websites, ensuring critical business functions remain uninterrupted. Begin by opening the Settings menu within Edge and navigating to the "Default browser" section.
More About How to use ie mode in edge
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