Mouse cursor is very small in Windows 10 guest OS running on Parallels Desktop 14 for Mac.
Hardware -> Graphics -> Resolution -> 'Best for exteral displays'
Guest OS (windows 10):
Display -> Scale and layout -> Size of text -> 100%
Display -> Scale and layout -> Resolution -> 1680 x 1050
Hardware -> Graphics -> Resolution -> 'Best for exteral displays'
Guest OS (windows 10):
Display -> Scale and layout -> Size of text -> 100%
Display -> Scale and layout -> Resolution -> 1680 x 1050