You can hide experience details from the resume by unchecking the box for each detail item.
(hidden details can be revealed later by clicking "Additional experience" on the resume)
Job titles with no details selected will not appear on the resume at all, and there will be no link to reveal them.
You can change the order that each Company, Position, and Detail appears in by dragging them to a new order.
To make things easier to reposition, you can collapse each section. This will not affect whether or not it appears on the resume.
You can save your changes without affecting anything else on the site - please feel free to experiment!
If you want to revisit a resume you've made changes to, take note of the URL after you save it.