You can add a new page to your document from the scroll view or the document timeline.
The scroll view lets you navigate through your document pages vertically.
You can add a new page in the following ways:
Option 1:
Click the + icon on the page controller to add a new page.

Option 2:
Click the Page Sorter option.

Hover over any page and click the + icon to add a new page.

You can also add pages using the document timeline.
Option 1:
Click the + icon next to the last page to add a new page.

Option 2:
Hover over any page and click the More (···) option.

Click + Add Page.

Follow these steps to open the document timeline:
Step 1:
Click the Page Timeline option at the top corner of the page.

Step 2:
Click Show Document Timeline.

You will now see the document timeline view.
