Reload and Refresh the Form
Form Studio uses an embedded browser during the development of your forms, so that the pages look the same as they will look when running in the users' browsers. However, this can mean that, because of the way that HTML works, sometimes changes you make to a page don't always get immediately reflected in the Form Design workspace.
When this happens, you can use the Reload and Refresh options to update the display and force your changes to appear.
The Reload option will regenerate the HTML, CSS and JavaScript required to implement your form and then redisplay the current page. This option is available from the Editor group on the Ribbon's Home or Developer tab or by pressing Ctrl+F5.
The Refresh option simply clears the current display and reloads the form. This option is available from the menu displayed by right-clicking in the grey border around the page display in the Form Design workspace, from the Editor group on the Ribbon's Developer tab or by pressing F5.