Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
With Strategy Library 10.9 and 10.10, users noted that when running a Report Services Document on a 12.9-inch iPad specifically, the document does not re-size accordingly to fit the screen. View the image below for the re-sizing issue:

This is a known issue in Strategy Library 10.9 and 10.10 when running on a 12.9 inch iPad.
Our engineers are working to enhance the overall Strategy experience for mobile.
This issue is fixed in Strategy Library 10.11. Please upgrade to this version to take advantage of the fix.
Interested in learning more about Report Services Documents or Dossier? Visit the Learning Center on Community!
Or feel free to go to our Documentation pages for product information.