Revoice Pro does not have built-in UI scaling options, but will respond to Windows' own scaling tools.
High DPI scaling can be adjusted on a per-app basis from the app's properties.
In Explorer or in the Start menu, right-click the application name, select Properties, select the Compatibility tab, and then click the "Change high DPI settings" button near the bottom to access the settings.
Most often, checking the "Override high DPI scaling behaviour" checkbox and choosing one of the three options from the related dropdown will allow Revoice Pro to display properly.