Banktivity allows workspaces which allows you to organize the display of your content, which can be particularly handy on large-format displays. 

In the space to the right of the Banktivity sidebar, you can view multiple workspaces. Each one can be used to display an account, report, budget, website, or any other view available in the document. Each workspace operates independently so that you can navigate back and forth in each workspace without affecting the others.

NOTE: A minimum display width of 1440 pixels is required to use workspaces.

You can read more about workspaces in Banktivity 6in the built in Help files here.