So, when I export my game as a .jar file, the application runs the main menu size fine, but any world opened from that point onwards does not have the window resized and instead has borders from the previous world. For example, going into my second world from the menu, which is smaller than the menu, has images from the menu still displayed while the second world is crammed in the corner because its smaller and the window does not change. My third world however, is MUCH bigger than the main menu and as such you cant see anything without scrolling as the window once again does not resize and just stays at 600x400. Please tell me I'm being stupid and there is an easy fix or else I'm deleting this college project and jumping from a bridge.