Hi kdimaria,
I know that you don't want css or javascripts but the easiest way is css and in the Splunk 7.x Dashboard Examples you can find an useful example to do this.
In this app you can find also a way to change panels width using a javascript.
It's also possible to insert in a dashboard some html tags to modify a panel, but anyway you use a css element in a Splunk dashboard: e.g. I have four Single Values in a panel and I want to be sure that they are two for each row, to do this you can insert between panel tags
<html>
<style type="text/css">
.single {
width: 50% !important;
}
</style>
</html>
Anyway you're using css elements.
Bye.
Giuseppe
