Your screen freezes, or your design preview does not display, due to the conflict between the Ouidah Designer plugin script, and the script of your active theme. To prevent this from happening only one script should be allowed.

Solution:

  1. Go to WPD > Settings > General tab.
  2. In the “Load Bootstrap Modal” field, change the setting to ‘No’.
  3. Save the settings by clicking the “Save” button.