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,
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)?