Page orientation is a property of the page style. A page style can have only one orientation.
Consequently, you need at least two page styles, e.g. Default Style for portrait and Landscape for landscape.
Transition between the page styles is done through a “special” page break, not the simple Ctrl
+Enter
, but Insert
>Manual Break
>Other Break
where you can select the “next” page style, the one in effect after the break.
To show the community your question has been answered, click the ✓ next to the correct answer, and “upvote” by clicking on the ^ arrow of any helpful answers. These are the mechanisms for communicating the quality of the Q&A on this site. Thanks!