Expanding chrome os into the partition

[maxed4901]

Hey guys. So I finally got a fully functional (so far) ChromeOS on my i7 8th gen. I created a 128GB for chromeOS and used 18GB as the size of image.

I came across a video that says to expand the ChromeOS to the USB. It doesn't say internal partition or SSD. What I want to do is extend my chromeOS image to the full 128GB. Below are the commands I found..

Ctrl + Alt +F2
Root
Resize data

Any help would appreciate it!