You need to use css for this.
I usually assign a new class to the listview and then modify in main.scss
For example:
.listview-smplus.mx-listview {
& > ul > li {
padding: ($grid-padding-top * $listview-scale) ($grid-padding-right * $listview-scale) ($grid-padding-bottom * $listview-scale) ($grid-padding-left * $listview-scale);
}
}
where the variables used are defined in custom-variables.scss