Hello,

First of all thanks for choosing our Theme, we are glad to be you in the WoodMart WordPress family :).

The only way is custom CSS. Add this code to the Theme Settings > Custom CSS:

body .menu-mega-dropdown .sub-menu>li>a, .mega-menu-list>li>a, 
body .search-by-category .input-dropdown-inner>a,
body .woodmart-navigation .item-level-0>a{
text-transform:none;
}

For the other sections please provide some relevant screenshots with the URL of the website to check it myself and help you out accordingly.

Regards.
Xtemos Studios