How can I print only one side of my family tree?

There is currently no option to choose a specific branch when creating an all-in-one chart.

 There are 2 options to show only one side of your family tree when you create a family chart. 

1) You can create an Ancestors/ Descendants/ Close Family chart with the main person as someone suitable for showing the side you wish to print..

2) You can export a branch of that side of the family as a separate GEDCOM file and create the all-in-one chart for that specific branch, by following these instructions for exporting a branch from your family tree:

How do I export specific branches of my family tree in Family Tree Builder?