Hi

Thanks for contacting us. You can use this custom CSS

@media (max-width: 575.98px){
#sppb-addon-1646654460185 .sp-slider #sp-slider-item-1646654460185-num-1-key #sp-slider-inner-item-1646654460187-num-0-key {
    font-size: 29px;
    line-height: 65px;
    white-space: nowrap;
}
}
@media (max-width: 575.98px){
#sppb-addon-1646654460185 .sp-slider #sp-slider-item-1646654460185-num-1-key #sp-slider-inner-item-1646654460187-num-1-key {
   font-size: 29px;
    line-height: 65px;
    white-space: nowrap;
}
}

Go to system--> https://prnt.sc/tDbSUJh6LiGu --> Default template-->Template options--> https://prnt.sc/A5nlsBvCQsqs And add your CSS there.

-Regards.