- Acme Themes

Yeah, thanks, in fact I did both and it works much better now.
I set Full Screen Background on Feature Slider Image Display Options but also added this in CSS to reduce slider titles font-size to 36px:

.home-bxslider .lead {
    display: block;
    color: #ffffff;
    font-weight: bold;
    font-size: 36px;
    text-transform: uppercase;
    width: 80%;
    margin: 0 auto;

I think it’s OK now, many thanks!