Helllo,

There are two ways: Advanced typography using this custom selector: body .tabs-layout-tabs .tabs li a

Here is the documentation providing more detailed instructions: https://xtemos.com/docs/woodmart/advanced-typography-settings/

or you can add this code to the Theme Settings > Custom CSS > General and set your styles:

body .tabs-layout-tabs .tabs li a {
    font-size:20px;
}

What would you like to change: size? color? Do you need help with the CSS code?

Best Regards