Thanks for the info @is-kal4! Docker Toolbox is a bit of a pain (and it is a legacy solution - I wouldn't be surprised if it is discontinued in the near future), since it runs Docker inside of a VirtualBox VM, instead of running Docker natively. In my opinion you would be better off using the QIIME 2 VirtualBox Image - since this will be less overhead on your computer (then you would only be running one form of virtualization, instead of two). If you choose to stick with your current arrangement, there isn't too much help we can provide specifically about resizing your Docker Toolbox VM, but a quick Google Search yield this: