Changing Window Title and Icon Yes, you can do that with KubeJS too. To change title, all you have to do is change title in kubejs/config/client.properties. To change icon, you create a kubejs/config/packicon.png image in standard Minecraft texture size preferably (64x64, 128x128, 256x256, that kind of size). The image has to be saved as 32-bit PNG, not Auto-detect/24-bit, otherwise you will get a JVM crash! Here's how to do that in PaintNET: Example result: Currently incompatible with Fancy Menu!