0👍
I don’t think you need to overwrite the sass variable in this case, just the target class on the specific instance.
<div id="app">
<v-app id="inspire">
<v-treeview class="narrow" :items="items"></v-treeview>
<v-treeview :items="items"></v-treeview>
</v-app>
</div>
<style>
.narrow .v-treeview-node__level {
width: 8px !important;
}
</style>
Source:stackexchange.com