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I'm using blivet-gui 1.0.6 on Fedora 23 but I have also tested blivet-gui 1.2.3 on Fedora 24 alpha. I have btrfs volumes on both physical drives as well as on LVM2 logical volumes. There does not seem to be a way to resize (grow or shrink) btrfs volumes from within blivet-gui. This capability exists within the btrfs command line tool but it would be great if it were also possible to accomplish from within a graphical application. Thanks for considering this feature request.
Blivet unfortunately currently doesn't support resizing of btrfs volumes. *** This bug has been marked as a duplicate of bug 962143 ***