Hello, mohamed emad,
In order to address your issue, please navigate to XStore > Theme Options > Header Builder > Main Menu and select the desired Text Color (Hover, Active) and Line Color (Hover, Active) and Publish it.
For further reference, please refer to the image provided at the following link. https://postimg.cc/64qSzYGh
We hope this helps.
Best Regards,
8Theme’s Team