Mac OS X El Capitan has a lot of cool features yet to be explored by users. If you are a pro-user, you must be familiar with this information on how to maximize El Capitan windows without going full screen.
Earlier, users had to zoom any window by clicking on the green button from the upper left corner of the window to view maximum content on the screen or web page. But some users don't like this behavior, and therefore, OS X El Capitan offers a simple solution.
In OS X Yosemite, users could easily maximize a window by holding the Option key and clicking the green button. But there was a possibility to click the green button without holding Option key; this would result in a full-screen window, which was not acceptable.
There is a much better way to maximize windows to fit the size of the content: double-click on the title bar. The feature should be enabled by default on your Mac, but if, for any reason, it is not enabled, you can easily do this.
How to Maximize Windows Without Going Full Screen in Mac OS X El Capitan
Step #1. Click on Apple logo in the left corner of Mac screen.
A menu will drop down with a few options.
Step #2. Click on System Preferences.
Step #3. Now click and open Dock, which is next to Desktop & Screen Saver.
Step #4. Check whether or not checkbox next to “Double-click a window's title bar to…” is checked. Also, confirm that zoom is selected in the drop-down menu. If the checkbox is unchecked, don't forget to check it.
Now you can manage your El Capitan windows with a good amount of options: click the red button to close, yellow to minimize, green for full screen and double-click on the title bar to maximize to fit the content.