https://bugs.winehq.org/show_bug.cgi?id=50981
--- Comment #5 from Lemonzest lemonzest@gmail.com --- Maybe I should include some more info for clarity, to enable the taskbar first run winecfg and enable a virtual desktop of 1600x900 for example then apply and ok to exit, then save this snippet in a file called EnableShell.reg
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Wine\Explorer\Desktops\Default] "EnableShell"=dword:00000001
then run wine regedit EnableShell.reg and then run winecfg again and you will see the taskbar as it should be, but when I enable virtual desktop sizes 1920x1080 or 2560x1440 it is as I described earlier, no taskbar indicating the view is cut off and this manifests in games too with cut off item bars.