I have not changed any Registry Entries, and did not know there was an experimental option to do so.
I had previously used Pin More, TileIconify, and Better Start Menu to change and modify tiles, but all were uninstalled when I upgraded to Windows 11.
Here is what my menu looks like.
The "Tiles" are all Windows Apps or games installed from Game Pass which operate like Windows Apps,
https://imgur.com/CbU9q5J
However the Blizzard and GOG.Com icons in the centre column seem to be grabbing old custom Tile graphics I made from somewhere.
Can you provide the registry info so I can access the experimental mode(s)?