Hi
Thank you so much for reaching out!
As for Related Products Title underline bar is concerned it is probably looks that you have added a custom CSS code in your website https://prnt.sc/10fyfmr
Can you please remove this code or send us your website temporary wp-admin access so that we will guide you better.
You can also change the border color by going to Dashboard > XStore > Theme Options > WooCOmmerce (Shop) > Single Product Builder > Related Product. https://prnt.sc/10fyko3
Robert Hall
Customer Support















