What is the size needed for custom backgrounds to fill the table? Thanks!

You can enter your own map if you click the "Objects" button at the very top, then click "Components", and in that section you should see an option called "Custom". Clicking that will open it's contents, where you will find what you need to add whatever you like. Just click and drag to the table.

Hope this helps!

Awesome table, but how can i put in my own encounter maps?