Marquee zoom is a feature that has been in many Adobe applications for years, such as InDesign, Illustrator and Photoshop. It allows you to zoom in on a particular area of your document, by dragging around that area using the Zoom tool or using keyboard alternatives to the Zoom tool. But that all changed with Photoshop CS 5, when the marquee zoom feature was disabled and an alternative zoom method called Scrubby Zoom took its place.
Bringing it back
Luckily it is easy to bring back Marquee zoom feature and here is how. Select the Zoom tool in the Toolbar (highlighted in red below).
Next in the Option bar turn off Scrubby Zoom.
That’s it! so now that it is enabled again I can tell you how it works
To use marquee zoom, select the Zoom tool or hold down Command + Spacebar (mac)/Control + Spacebar (windows) and click and drag out a marquee (rectangle) around the area you want to zoom in on with your mouse. The marquee is show on screen as dashed lines – see image below.
Now release your mouse, yes I know – wow, you have just zoomed into the area you wanted too.
Sometimes the old methods are still the best.