Hey there,

Thanks for reaching in,

Please use this CSS in Salient > General Settings > CSS/Script Related > Custom CSS Code

@media only screen and (max-width: 690px) {
#slide-out-widget-area.slide-out-from-right .inner .off-canvas-menu-container li a {
    font-size: 18px;
}
      }

Hope this helps,

Regards