To access page setup click "edit styles and formatting" found at the top right of the page:
IMPORTANT NOTE: This is only available in the proposal or template editors. If you're working on a section, then it will adopt the page settings of the template/proposal you add this section to.
This will bring up the styles and formatting menu. From here, click the "page" tab from the right-hand menu:
You can set the following:
You can set the page size to
Keep in mind when switching between landscape and portrait that your content (text boxes, images, etc) will not shift with the orientation so you'll need to adjust your proposal content as well.
This is where you can change the size and positioning of your flowed text box.
Adding extra left margin will push your master text box out from the left of the page.
Adding top margin will push it down from the top of the page and so on.