The Page Orientation controls the way a page is oriented for normal viewing of PDF exports.
Note: Changing the orientation won't impact/update any previously created forms.
Steps:
Navigate to the folder where the template was originally created (e.g either in the Home Folder/Team Folder)
Click on 'All Templates'
Select the template checkbox
Click Edit Template
In the Template Editor, select 'Page Orientation'
In the dropdown, select either Portrait (default setting) or Landscape
7. Click Save in the top right corner of the screen to finalise your changes