Adjusting QGIS 3.6 Print Composer default output resolution?

How do I change print layout size in QGIS?

2, in the Layout Manager, you can now find that setting in Layout–>Layout Properties–>and under the Layout tab click the Resize layout button. Save this answer. Show activity on this post. After you resize the basic page you also resize the map object and any other objects to the borders of the page.
 

How do I export a high resolution map from QGIS?

From your map layout:

1. Layout > Layout Properties
2. Choose the Layout Tab > Export Settings > Export resolution.

How do I change print layout to portrait in QGIS?

Quote from video: So why is QGIS doing this I'm not entirely sure but. I did eventually find the answer I think it was on north roads 20 feet perhaps. So why not check out their Twitter feed and at the same time why