Entities missing from Entity registry

I’m trying to create groups (rooms), but I can’t find entity IDs. I reckon they should be in Entity Registry (which says it “keeps a registry of every entity it has ever seen”) but all lights (and more) are missing, despite working fine in Hass. In Customization there ARE all entities, but alas, entity IDs are not shown. Any tips?

Go to the /dev-state page. You can see all active entity IDs there. It looks like this in the sidebar: <>

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Ah, yes! I completely forgot about the Developer menu. Thanks!