Is your feature request related to a problem? Please describe.
My feature request isn't related to a problem, it's just an enhancement.

Describe the solution you'd like
The best solution could be to have the ability to hide/show items on the schematic placement when hovering over them in the material list, using a boolean. This would allow us to show only specific materials, rather than just one.
With this feature, we would be able to build something step by step, similar to real-life construction of material parts, rather than just layer by layer.

Describe alternatives you've considered
Another option could be to show only the item you click on. However, it may be less interesting.
Currently, the only way to achieve this is by creating multiple schematics for each step.

There is a configurable system planned for this.

Currently you can achieve this via the Schematic Edit mode, by removing all other blocks except the one you want to build. You can do this by holding the schematicEditBreakAllExcept key and punching one of the blocks in the schematic you want to keep. Note that this is blockstate-sensitive though. You can then revert the edit by clicking on the Reload button in the Loaded Schematics list.

See the wiki for more info about the Schematic Edit mode.