In Primavera P6 you can save a layout of your columns and displays so that next time that you want or need to use that kind of layout you will just load it and as a result Primavera P6 will instantly change display according to that loaded layout. This is useful because you need different columns and displays depending on what you are doing in Primavera P6, like status updating, making a look-ahead, loading resources, etc.
Everytime you have a different activity you change columns, groupings and filters and because of this changes your Primavera P6 layout also changes dynamically. When you are using Primavera you will find that there are layouts you are more comfortable to use, and some layouts that you use everytime you print a particular kind of report.
You can learn more about Primavera P6 layouts in the following video.