Optimize a spread layout by aspect ratio (retired in 1.4.0)

The Optimize Spread Layout button was retired in version 1.4.0, along with its \ shortcut. With Best fit on (the default), the first layout in the Templates panel is the optimized layout for the photos on the spread, and it can be a justified layout that crops nothing, so click the first card. The tutorial clip below still shows the old toolbar button.

Starts at 41:54 in the full tutorialWatch on YouTube