Some sophisticated programs can mean that the layout of your Opus page becomes quite cluttered and on older machines it can be slow to redraw. This option allows you to display only the object you are currently working on. All other objects are completely hidden. Note that once you have finished with one object you will need to switch Show Selected Only off to select another object to edit.
1: Select Show Selected Only from the View menu
2: To reverse the setting, simply repeat the process.