Hi,

That's pagination from WordPress itself, and there is no way to reduce the total number of pagination..

But, you can try add more this code to Customize > Custom CSS to make it display on one row:

@media only screen and (max-width: 479px){
.penci-pagination ul.page-numbers li span, .penci-pagination ul.page-numbers li a {
    width: auto;
    min-width: 25px;
}
}

Best Regards,

PenciDesign