The approach that @James mentioned is similar to the one I use in my dashboards. Though I tend to have one ‘main’ dashboard that serves as a navigation point and then use the ‘Back’ (or Home) navigation that James mentioned on my sub dashboards.
A bit more technical effort involved, but another approach for the those familiar with HTML would be to create a menu in HTML and embed your SharpTools dashboard in that. There’s also some editable examples linked in the iframe API help article.