Hi there!

Thanks for your query.

Did you mean this one? https://prnt.sc/BNA_0kr0BX7M

Then you may try this custom code in your custom CSS:

.sp-slider .sp-item .sp-background {
    background-position: 50% 50%;
    background-size: contain;
    background-repeat: no-repeat;
}

Hope this will improve the visibility.

Note: Path towards custom CSS(Joomla 3): Extensions>Templates>Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

Best Regards