When using a display supporting some UHD or 4K/4K2K standard, icons might be very small, where some texts might be larger and others smaller.
PTV Visum 18 will support the 4K2K standards. Workaround (as example for PTV Visum 17): - Select the file C:\Program Files\PTV Vision\PTV Visum 17\Exe\Visum170.exe - Right-click to open the context menu. - Choose: Properties -> Compatibility - Set the option 'Override high DPI scaling behavior.' - Try the options for 'Scaling performed by:'