Attached is a prpt against sample data with the following attributes:
My resolution is 1920 x 1200. You can adjust yours accordingly.
1. No data query necessary.
2. Create a prpt with many Parameters.
3. Set the Page Layout to Custom and take note of the settings.
4. Set layout to Landscape.
5. Set the parameter-layout to horizontal.
6. Publish the report.
7. Note that the last parameter is 'cut'; not completely on screen. Closing the solution browser helps, but with additional parameters, I would need scroll bars to see them. Add another parameter if you need to.