From Fedora Project Wiki
- Ensure only the single target device you prepared is selected as the installation target disk.
- Ensure the Advanced Custom (Blivet-GUI) option is selected under Storage Configuration, and complete this screen.
- On the BLIVET GUI PARTITIONING screen, delete all existing partitions (if any).
- Create any necessary bootloader partitions (e.g. EFI System Partition for UEFI installs, BIOS Boot partition for BIOS installs onto a GPT disk, PReP boot partition for PowerPC installs).