You can add the following head-end.html file to the scene directory.
<style>
#view-list {
left: 10px;
right: unset;
}
</style>
Please note that, as described in About the Customization category, customizing the viewer to user’s needs is out of scope of the support offered by Shapespark. The Shapespark support team answers some of such questions, however in general there is no guarantee of an answer or a time for an answer.