Mod Debug World Type
Minecraft has a little-known world type called debug world type, which can be activated by holding the Shift key when selecting the world type. This mode displays absolutely all game blocks along with all their variants.
This modification alters the standard debug world, focusing exclusively on content from a specific mod. To do this, simply specify the mod identifier in the name of your new world.

This utility is primarily intended for mod creators and pack makers who need to isolate specific content for debugging or creating screenshots. It can also be useful for mod reviewers wanting to thoroughly study blocks from a particular addon or quickly demonstrate all element variants.
Source video material demonstrating capabilities: [Embedded demonstration video will be here]