By default sorting filers (NEWEST POPULAR PRICE (HIGH TO LOW) PRICE (LOW TO HIGH)) are not displayed on the mobile. If you wish to turn it on, please add this CSS to your additional CSS

@media (max-width: 1023px) {
.mh-filters {
display: block!important;
height: auto!important;
float: left!important;
width: 100%!important;
margin-bottom: 12px!important;
}
.mh-search__results-wrapper {
padding: 0!important;
display: inline-block!important;
width: 100%!important;
}
.mh-save-search-button {
float: left!important;
width: 100%!important;
margin: 0 -12px 24px 0!important;
}
}

In this article you can find information how to add custom CSS to any WordPress Theme: How to add CSS code that is future update compatible