u/TheEy3Guy

Although Microsoft removed the option from the settings, there is still a command-line flag (--disable-features=msFeatureGroupNewLookAndFeelHoldout) that re-enables the feature; the permanent and global way to do this is by modifying the registry:

1. Right-click an empty area on your desktop, then select New > Text Document.
2. Open the text file in Notepad and paste the following code exactly as shown:

​

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge]
"CommandLineFlagSecurityWarningsEnabled"=dword:00000000

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge\CommandLineArgs]
"1"="--disable-features=msFeatureGroupNewLookAndFeelHoldout"

1. Click File > Save As...
2. Under Save as type, change Text Documents (*.txt) to All Files (.).
3. Name the file FixEdge.reg (make sure it ends with .reg) and save it to your desktop.
4. Double-click the newly created FixEdge.reg file, accept the Windows warning, and click Yes to merge it into the registry.

For Edge to process this new system policy, you must reload its policies after ensuring all background instances are closed:

1. Open Microsoft Edge.
2. In the address bar, type edge://policy and press Enter.
3. Click the Reload policies button at the top of the page.

Note: This workaround may only be temporary, as Microsoft could remove support for this command-line flag in a future version of Edge :(