Currently testing F28 and qt5-qtbase is hit by the "columns" bug as it was in
qt5-qtbase-5.9 on F27 which was fixed in 5.9.4. Discussed here
According to the QT bug report it is now fixed in 5.10 as well.
A side note, F28 beta is working very well for me.
Fedora 28 Beta (Twenty Eight)
Registered Linux user number #342953