Older UCS Manager uses Java application. The UI fonts could be extremely small on high DPI screen. The fix is:

1. Go to “C:Program Files (x86)Javajre1.8.0_171bin“.
2. Go to “Properties” of “jp2launcher.exe“.
3. “Compatibility” tab -> “Change high DPI settings“.
4. Check “Override high DPI scaling behavior….“.
5. Select “System (Enhanced)” or “System“.