I went to the Real and Imagined playlist as per the demo holograms page
https://blocks.glass/playlists/5e30fc4d-a1f0-4cf7-8048-b37fcb128647
Pressed the sync to your go.
And then it synced alright, but whenever I tried to press on anything else the blocks site gave me a an error that was something like "You are currently using someone else's playlist"
I poked around and there was no button to unsync from the playlist, and the app only showed those holograms from the playlist I was synced to
I was unable to resolve the issue, so I circumvented it by deleting and recreating my LG account instead.