The first formatting rule on the second section is: count(preceding-sibling::my:SharePointListItem_RW) > 4
If you increase the 4, you will increase the number of rows displayed.
The second and third section both have rules to disable the insert / delete widget after 10 rows. Right now, that formula is: count(preceding-sibling::my:SharePointListItem_RW) > 8
It looks like I have an error on the second section and that number is "9" there. Basically, the rule prevents the user from adding rows. But if you want to remove that rule, they can add all the rows they want, or you can increase the 8 in that formula.
Hope that makes sense - I'm glad I was able to help you.