Cannot resize input tables..at all.

Cannot resize input tables..at all.

Hi,
I cannot resize any of my tables in my invoice. On the video it shows her selecting it so she can make it shorter, taller, thinner etc but I cannot do the same thing. I have tried Chrome and IE to no avail. Basically there is a massive gap between the bottom of customer details and the top of the details of the items purchased which even with 2 items purchased can force the invoice from 1 to now 2 pages (second page has 1 line of text on it!) 
The invoice template I use is the professional with some placeholders added, even if I create a new template I still cannot change it, can anyone help please?

Thanks,
Chris
Paid user.