Create a Keyboard Shortcut for Preview Mode
How do I create a custom keyboard shortcut to toggle between Preview and Normal view?
You may already be aware that InDesign offers a built-in shortcut that switches between these two screen views: the W key. (No command, option, control, or other modifier key is necessary!) But there's a problem with this shortcut: It doesn't work when you're editing text in a text frame. Instead, pressing "W" types the letter? well, you get what I mean.
So if you want a shortcut that will work all the time -- even when editing text -- you need to create your own shortcut.
First, select Edit > Keyboard Shortcuts. Choose a shortcut set other than Default from the Set pop-up menu, or create one by clicking New Set (it's not a good idea to edit the default set).
Choose Tools from the Product Area pop-menu, and scroll down the list of features to choose "Toggle view setting between default and preview":
Now click in the New Shortcut field and type the shortcut you want; in the image above, I've typed Ctrl-Option-W, which (according to the note below the field) is not currently being used elsewhere. Finally, click Assign and OK and try it out!