I can't figure out a solution to solve the problem of getting left and right white borders. They appear when I preview the content in storyline, LMS or Articulate Review. However they are not there when I design in Articulate itself.
It is a matter of a few pixels added on each side. These white borders appear when I use Title Feature within the Articulate frame. The story size I design in is: 1920 x 1080. I tested with different settings where I deducted the 23 pixels for title and not, and it doesn't make a difference.