With this tweak mod, when you press F9, you can switch the display of chunk borders. There are 2 options: display only the corners that are marked with a red vertical ray, or display the corners together with a green grid on the borders of chunks.
How to install Chunk Edge Indicator
- Download and install Forge
- Download mod
- Unzip it and copy to C:\Users\User_Name\AppData\ Roaming\.minecraft\mods