The ability to resize the map and listings are alerady available to you in the free version.

In the settings area when you are looking at the demo version, you can drag and drop the edges of both the map and the listing to change the height and width of the map and columns. As you are moving them, you will see the sizes change. If you need to tweeak.

Here is a screencast stepping you through how it is done: https://d.pr/v/SoTULF