I know there are several questions about this topic, but none of them appear to help me.
When I first started using Ubuntu, I used Windows Disk Manager to shrink the NTFS partition that came with my computer so that I could dual boot Ubuntu. Now, I'm barely using Windows anymore, and so I'd like to extend my root partition. I shrunk the Windows partition from within Windows to create a bunch of unallocated space adjacent to my BTRFS partition. However, GParted is not giving me the option to extend my root partition--only to shrink it. Here is a screenshot of GParted:
I'd like to extend SDA7 to the left using the 397 GB of unallocated space next to it. However, when I click "resize/move partition," it tells me that SDA7 is already the maximum size.