Textures

Resize the texture on the object

Byako: you can if the texture scaler flag is activated on the material, then you can scale it with x/y on vector 2 arguments

Then in your game entity you can customize as needed:

You can also use z/w to displace the material.

I get "unable to save material" if i try to set anything diffrent on it and "save"

If it's a native material, you need to override it in the resource browser. Though in that case you'll need to publish the assets files along your scene.