I don’t understand the essence of the mod, I’m already trying to look at ready-made schematics - but the window where the isometric image should be is empty, I just don’t understand how to use this mod and what it is, there are no guides, no reviews, and the potential on the page is painted to the maximum. I would like to understand how to synchronize the world edit with an axе and a stick, how to view isometry, how the mod works in general, since information is freely available - 0

Mod's settings can be accessed from ModMenu

• renderPreview enables schematic 3D model, note however that it only works for .litematic files
• autoWeSync in WorldEdit tab enables the sync. It will sync to existing selection automatically and update when you change it.

Thanks for your report, I see how it can be confusing and I'm going to update descriptions in the next release. Let me know if some feature is unclear.

Yes, there is a question - I have a quilt 1.19.2, I do not know if this is the problem, but still this is what my rendering looks like -

I do not really understand what the problem is, I think the format is lightmatic, but it is not visible. And a question off-topic, is it possible to change the blocks in the scheme itself? Let's say there is already a ready-made scheme, and I want to replace the cobblestone on the dirt, is it possible? If not, is it in your power to create such a function with your mod?

Ah, schematic previews are only available since 1.19.3 and generally new features are kept up to date with latest mc versions.
Answering the other question: Litematica can do that, check it's wiki page.

will there be isometrics on 1.19.2?

There's quite a big change between 1.19.2 and 1.19.3 which breaks the render, so that is unlikely.

Great, thanks a lot for the info