Increasing the size of all content
On your iPad go to settings. From settings go to Display and Brightness. Go to the page on the right and move to bottom of page. There you will see View. Tap on that header and you'll get a page called Display Zoom. Select if you want Standard or Zoomed display. After checking Zoomed hit the set button. You may have to restart ipad. This increases size of the displayed items but i don't know if its 20% or not. There may be other ways to fine tune this but I don't know how.