How can I block this function in edge? Is there a reg key or group policy or anything that can help with this?
If you click the 3 dots top right of edge, go to apps, you can install any site as an app.
Any ideas?
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Currently, there is no registry/group policy to disable the "install this site as app" function in Edge.
You could follow this opening feature request if there are any updates.
Of course, you could also submit a Feature Request through the browser ("..." menu > Help and feedback > Send feedback) which can help the team prioritize.
Thanks for your understanding.