Please help me to understand your question correctly. You want to show text when hovering over some field?
If that is the case, you could use the widget "Bootstrap Tooltip", available in the app store. You could use a microflow or statically type text you want to show. Also it is possible to restyle the boxes using css.
If you wanted to hide or show rows/columns, you could also use the groupbox which is one of the containers available in the modeler.