@jason_hotchkiss try adding following CSS where id of check box needs to be set as id="checkBoxClear"
<row depends="$alwaysHideCSSPanel$">
<panel>
<html>
<style>
#checkBoxClear[data-view="views/dashboard/form/Input"]{
width: 100px !important;
}
</style>
</html>
</panel>
</row>
By default input fieldset width is 220px, this override reduces by half. Once this works you can move the configuration to a static CSS file under the appserver/static folder of your Splunk app. Refer to documentation: https://docs.splunk.com/Documentation/Splunk/latest/Viz/PanelreferenceforSimplifiedXML#dashboard_or_...
You can also refer to Clarafication blog by @cmerriman in case you want to pick up on learning about CSS Extensions in Splunk Simple XML dashboards: https://www.splunk.com/en_us/blog/tips-and-tricks/splunk-clara-fication-customizing-simplexml-dashbo...
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