The NOOBS image is designed to get new users up and running quickly to play with different OS environments but it is extremely limited has no built-in ability to resize partitions. Once you have decided on a preferred OS, longer term, you really should consider migrated away from NOOBS and make a dedicated OS install for your preferred OS. NOOBS "wastes" a lot of space with the other OSes that you ultimately won't use.
As suggested by @nsilent22, I have had some success resizing partitions with gparted which I access using a Ubuntu virtual machine on my Windowz machine.