Robert, you are confusing the user browsers with the API that programs must use, as has been mentioned before.
Yes, Microsoft Edge came out 5 years ago, but only recently radically changed to a Chrome based engine.
For many, many years Microsoft has only provided a browser API based on the Internet Explorer engine.
So that is what Calico Pie and every other developer have to use and is what every version of FH uses.
Microsoft offered the WebView and then WebView2 browser API based on Edge only last year.
So with all the other changes, that was too late for CP to incorporate into the FH v7.0 first release.
Just because a product is not supported does not stop it from working.
You are not alone. The advice from Calico Pie is to use the External web browser rather than the web search facility, which makes one wonder why they have put in a facility and then recommend it be not used.
A cursory examination of the Microsoft website seems to suggest that they have for some time been advising Devolopers to switch (Microsoft Edge came out 5 years ago) and Internet Explorer will cease to be supported some time this year., I think in August so who knows what will happen then
I have switched back to using the FH web browser so that the hints update automatically but every now and then get a big banner to say "Internet Explorer is going to stop working, use Edge".