Many people may find Edge automatically changed to the Dark Mode when opening it. If you did not get used to the new model, you can switch back to the Light Mode following the steps below.
Step 1: Click the "Control" icon on the top right corner (three dots), and click "Settings" from the list;
Step 2: Click "Appearance" on the left and select the "Light Theme";
Step 3: The theme will change to the light one.