The Newly Added section of the Products landing page only shows 20 items but I know I have more than 20 newly added items. Is it possible to increase the amount of items from 20 to show more when i press next?
Not at this time. 20 is the default for the number of items to be show in all these sections and it is not configurable by store. However, there's a very useful Products report that allows you to see when goods were create, made live and modified. You can change the Start Date and End Date of this report and use the Export to Excel feature to get a bunch of useful information about the products in your catalog.
Date Created: 09/10/13