Printing less task lines:
Here are some ideas on how to view the task lines for printing.
Info in the grid will be what is printed.
You can filter your project start and finish dates.
Filter by double-clicking on the start date/finish date title name in their column. You will see a key appear for you to filter the dates of the task.
You can do the same with your resources column.
View and un-view completed tasks. Go to your view drop-down menu in the top toolbar. There you will see the option to "Show complete task" in your gantterAi™ grid.