Just wanted to alert you to a potential change in default anaconda settings that might be coming to be in a future fedora release: https://pagure.io/fedora-workstation/issue/152
From what I understand there is the potential that the default LVM+ext4 layout may be changed to a single volume btrfs or ext4 layout.
As this is a default it is probably not alarming (as Qubes customizes the layout anyway) but just raising awareness.
B