You can download it here:
curseforge: https://www.curseforge.com/minecraft/texture-packs/gui-2d
planetminecraft: https://www.planetminecraft.com/texture-pack/gui-2d-blocks-in-inventory/
Use this repository for Issues : https://github.com/DearFox/GUI-2D-Blocks-in-inventory-Issues/issues
Changes the display of blocks in inventory to 2D
This resource pack will render all blocks in the inventory in a 2D perspective.
A resource pack should be compatible with almost all other resource packs and mods. But I cannot guarantee 100% compatibility. If you want compatibility with some mod - let me know, I will add support for it if possible.