I've been looking through Anti-beacon, and I don't see anything standing out that I think would make those kind of policies. I might be missing it, it's a lot of things to look at. Under Optional there is Web Search Group Policy, but I think that is just to stop web searches being done in the start menu.
When you redownloaded Anti-beacon, reimmunized, then unimmunized again, that was a very good idea.
Such a good idea, in fact, I'm going to ask you to do the redownloading part of that again, though any reimmunizing or unimmunizing can wait for a bit. That is because if there is some policy set by Anti-Beacon it will show in it, and it narrows things down immensely. Also, if there was anything immunized in Optional, that does not Unimmunize when you Undo immunization under the protection tab, looks like it must be done individually, and you might not have been aware of that.
So, could you download and install Anti-Beacon again:
https://www.safer-networking.org/201...1-6-available/
When you're installing, when it gets to the part where it says something along the lines of "Stay Safe. Reapply immunization after each system restart.", please Uncheck that, and carry on with the install.
Once Anti-Beacon is installed and open, please look on the Protection tab and see if it says "no protection applied yet." If it doesn't say that, then please scroll through and find anything immunized and post it here. Next, click over to the Optional Tab. It's easier if you put the window in full-screen. Then please scroll through and let me know if anything says All Blocked, and list what it is. Please don't immunize or unimmunize anything for the time being. That's so I can check on what it is first, it might be unrelated to the Internet Explorer restrictions, and/or something you set yourself elsewhere.