Only 2GB of 32GB available for /dev/root. Can it be increased to large size?

Why in the world would they make this so small, That makes absolutely no sense. Then there are no clear instructions on how to extend this to use all of the space on the eMMC. What in the heck were you thinking? How do I get all of my space so I can use this as my router come on! And by the way @Citric gparted doesn’t install at all.

root@OpenWrt:~# opkg install gparted
Unknown package 'gparted'.
Collected errors:
 * opkg_install_cmd: Cannot install package gparted.

Thanks,
Michael