"Try the text scaling options in the Windows system settings"

Yes that will work, but will affect the PC globally, which is good for my old eyes. I have my 4k display on my laptop set to 1920x1080 with the DPI scaling set to 175%. a few of the Vegas render settings menus are cut off at the bottom though. Otherwise you might try: right-click the Sound Forge shortcut and choose, 'Properties> Compatibility' and "Change scaling in high DPI settings"..check-mark "Override high DPI scaling". At the bottom select 'Application' context menu and "System (Enhanced)" There are other options in there you might try as well.