Vault 3 FAQ: How to Fix Problems with Multiple Monitors on Windows
If you are running Windows, with multiple monitors, and not all monitors are the same resolution, you may notice that Vault 3 has tiny windows and microscopic fonts. You can fix this:
Right-click Vault 3's desktop or taskbar shortcut. Right-click the "Vault 3" option. Click "Properties". Click the "Compatibility" tab. Click "Change high DPI settings.
Check the "Override high DPI scaling behavior" checkbox. Select "System (Enhanced)" in the drop-down list. Press "OK" twice to dismiss both dialog boxes.