Words are not displayed in the frontend edit course.
This happens when your color settings are not saved properly.
Please go to wp-admin->appearance->customize->body->single menu dark text color, and change this color and save the changes, now again change this color according to your requirements and then again save it.
This will save your color settings properly and you'll be able to see the colors.
thanks a lot are displayed now
Thanks for confirming, so marking the topic as resolved and closing the topic.