When hovering over a related field show the 'preview-eye' to make it possible to show related information without leaving the screen.
With the new preview-edit functionality enabled it will even save more time.
Thx, but we've already build this ourselves. (back in 2016)
there is a plugin that does exactly what you need :-)
pvView: Instant previews a click away | SugarCRM Module
Björn Canales Pfisterer
Technical Support Specialist