All assets in the engine/engineass folder are not displayed. The Generate All Thumbnails menu item is not active.
Why is this a problem? In other engines, everything is displayed correctly regardless of where the textures and materials are.
CryEngine 5.6.7. The engine is installed in the user's folder.
You are populating assets in the proper Assets folder for your project right (i.e folder for your current project)? and not the directory where the actual engine is installed? If assets don't show up its becouse of the lack of metadata, i.e .cryasset files. But please use the proper directories for your game project.