There are two solutions (if not more).
While in report designer open up properties and there click on page setup to pick landscape.
You then have to save printer environment, otherwise that landscape setting isn't kept in the FRX.
This has a downside, you save other printer environment settings, too and that may make a report less portable to any other printer. Therefore a solution not only for this but also other settings of a printer is to install the printer multiple times, give the printer installation a speaking name - for illustration purposes EpsonPhotopaperTrayLandscape and set this settings of this specific printer instance within Windows, ie a paper tray with photo paper and the landscape setting.
This is widely used as the simplest solution even to complicated settings, as the printer driver knows best how to set up the printer and so that's off your shoulders. As you can install a printer many times you can set all necessary options even more than the printer dialog VFP calls offers and Windows printer API then takes care of all that. All you need in your report then is a print area width and height matching the expected paper size and SET PRINTER TO NAME YourdeesiredPrinterAndConfiguration before the REPORT FORM call.
Chriss
PS: With the second solution obviously you don't save printer environment with the report. If you just do this for yourself the first solution is simple enough, but to manage multiple settings the second solution still is fine even just for yourself. The only annoyance is when you have many trays and want to have any possible setting combination you would need to set up a lot of instances of it. Usually you only need a few settings, though.