Thank you Olga for the great tips !!
One more thing seems nowhere to adjust… So for the sub-menu, when we navigate to one page e.g. About Us page http://144.208.71.24/~wwwlifebiotechco/about-us/, or e.g. one Product page http://144.208.71.24/~wwwlifebiotechco/product/grape-extract-antioxidant-mask/ , then the main menu of “SCIENCE”, or “Ovelia Beauty” which these two pages are underneath, are losting blue colour background, so user can’t directly know which main menu they are now on… https://prnt.sc/pan0is , https://prnt.sc/pan128 (should be like this: https://prnt.sc/pan46b ) Is there any associated setting to fix this? Thanks again.