How do you hide textures, change their transparency, and resize them?

Hello everyone. Could you please tell me how to completely hide specific textures from the game? The only method I've found is to set the value to "false" in the "ProjectOnTerrain" tag within the xdb file responsible for material settings. In most cases, this prevents the texture associated with that file from being displayed in the game. I need to hide the animated symbols displayed under the models of heroes and creatures on the global map. I've disabled this for all creatures and most heroes using "ProjectOnTerrain" in the xdb files (Material). However, for a few heroes, the textures with these symbols are located elsewhere (e.g., KnightSymbol.tga.dds), and they don't have their own xdb files (Material). Instead, there's a different xdb file. The problem is that this file doesn't contain the "ProjectOnTerrain" tag, and even if I add it myself, nothing changes. How can I hide textures in this case? What other methods are available?

Also, I'd like to know how to change the transparency of textures using the game engine itself, or is it only possible to do this in an external program?

Finally, I'm interested in changing the size of textures. Can I scale the size of the textures themselves, or do I need to change the size of the model that uses the texture to achieve this? As far as I understand, there are no models associated with the symbol textures. Or is there some geometry involved after all? How, for example, can I make the animated symbols under the models of heroes and creatures larger or smaller?