Once your basic system configuration is set, the installer will ask you to choose a partitioning option for your virtual disk. Choose Guided - Use Entire Disk for the easiest option.

Select the partitioning disk and hit continue.

It is highly recommended that you choose the All files in one partition option if you are a new user.

Confirm all the changes that are made to the changes to the disk on the host machine.

This will Erase Data on the Virtual Disk. This shouldn't effect data on the host machine, but it is worth noting.