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The Double Clique
Wikipedia: A double-click is the act of pressing a computer mouse button (or track pad) twice quickly without moving the mouse. Double-clicking allows two different actions to be associated with the same mouse button. Often, single-clicking selects (or highlights) an object, while a double-click executes that object, but this is not universal.
So this tip won’t change your life with Aperture, but little details can have an impact on your workflow. The above filler highlights a simple tip to close and open the different adjustment bricks in Aperture. Just double click at the top of each adjustment brick or section to collapse or expand it. No biggie but it does speed things up for me particularly when I’m on my laptop without a mouse or tablet with less screen to work with.
Also, in case you didn’t know, you don’t have to be so precise when it comes to turning the adjustment on or off. You can click in the checkbox and you can also click on the name of the adjustment which will check or uncheck that adjustment.
Here’s a double click you probably know, double clicking on the title line of any album, folder or project, highlights that title and lets you quickly type in changes.
Here’s one you may not know about. By repeatedly pressing the V key, you toggle between the image only showing up in the viewer, to the browser and viewer mode to a browser only showing all your thumbnails.
Double clicking in the viewer area will toggle between the viewer only mode (with a big image) and the viewer with browser.
Pressing the F key will get you to FullScreen mode, and get you out. But you can also double click on a photo in Full Screen to take you out of full screen as well.
These little tips if they work for you, can enhance and speed up your workflow. Worth a try.

After you click "F" you can click "Z" to blow up to pixel resolution to see the sharpness of your image. I use it a lot.