DW's interface is far from WYSIWYG, no matter what Adobe's marketing department has said about it over the years.
That being said, all you may need to do is switch to Design View in the Document Toolbar. DW's Live View Editor still has some growing to do before it will be able to fully take over for Design and Code View...
1. If it's not open already, go to Window > Toolbars > place a check by Document
2. Choose Design from the small triangle dropdown

If that doesn't do the trick, with Design View active...
1. Go to View > Design View Options > Style Rendering > uncheck Display Styles

This will likely make your page appear to blow apart, don't worry, nothing has changed in your actual code, just how DW's design View handles it. You should now be able to see and interact with any object hidden with "display:none"