Enabling Internet Explorer Mode in the new chromium-based Microsoft Edge

To expose in the new chromium-based Microsoft Edge the "Open sites in Internet Explorer mode" menu item you first need to enable IE Mode by putting in the Edge address bar "edge://flags/#edge-internet-explorer-integration" and selecting "IE Mode" as shown below.

Once you restart Microsoft Edge, under "Settings and more -> More tools" you will see an additional menu item "Open sites in Internet Explorer mode" to bring Edge in Internet Explorer mode.