So whenever I put my VM in full screen Parallels menubar will not hide completely, half of it will still be shown. When I hover my mouse to menubar of OS X, everything looks fine. This behaviour is only when I have my MacBook Pro 14" connected to any external monitor. My main monitor is a LG UltraFine 17" 5K but this also happens on different 4K monitors. Are there more people running into this and have a workaround?
Yes, I get the same behavior. It's really frustrating because sometimes maximized windows sit behind this partially exposed Parallels menubar, and you can't access the top of the Windows window. It does not do it on my MacBook Pro 14" screen, but it happens on both my other external monitors.