how to have only oracle vm virtualbox full screen

Hit the + C to switch from full screen to scaled. The black screen has to do with screen view.

It has nothing to do with the change in storage, because to get the storage to actually change in the VM you need to do a few more steps within the VM after increasing the size in the Media Manager. I've seen this happen on many of my VBox VMs.

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How to have only oracle vm virtualbox full screen