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Learn about designing apps for macOS. A sidebar — technically known as a source list — resides on one side of a window and is usually separated from the rest of the window by a horizontal splitter, which is often movable. A sidebar typically consists of a table view or outline view that lets people navigate and select items to act upon in the main portion of the window. Mac OS X Cheetah. Mac OS X version 10.0, code named Cheetah, is the first major release of Mac OS X, Apple’s desktop and server operating system. Mac OS X v10.0 was released on March 24, 2001 for a price of US$129. It was the successor of the Mac OS X Public Beta and the predecessor of Mac OS X v10.1. The Mac OS is a graphical operating system developed by Apple Inc. The tenth version of the Mac OS is the Mac OS X which was launched in 2001. The structure of the Mac OS X includes multiple layers. The base layer is Darwin which is the Unix core of the system. Next layer is the graphics system which contains Quartz, OpenGL and QuickTime.

Enter Split View

If you're using macOS Catalina or later:

  1. Hover your pointer over the full-screen button in the upper-left corner of a window. Or click and hold the button.
  2. Choose ”Tile Window to Left of Screen” or ”Tile Window to Right of Screen” from the menu. The window then fills that side of the screen.
  3. Then click a window on the other side of the screen to begin using both windows side by side.


If you're using macOS Mojave, High Sierra, Sierra, or El Capitan:

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  1. Click and hold the full-screen button in the upper-left corner of a window.
  2. As you hold the button, the window shrinks and you can drag it to the left or right side of the screen.
  3. Release the button, then click a window on the other side of the screen to begin using both windows side by side.

If you can’t enter Split View

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If Split View doesn't work, choose Apple menu  > System Preferences, click Mission Control, and make sure that “Displays have separate Spaces” is selected.

Work in Split View

In Split View, you can use both apps side by side, without the distraction of other apps.

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  • Choose a window to work in by clicking anywhere in that window.
  • Show the menu bar by moving the pointer to the top of the screen.
  • Swap window positions by dragging a window to the other side.
  • Adjust window width by dragging the vertical line between the windows.
  • Switch to other apps or your desktop with Mission Control, or use a Multi-Touch gesture such as swiping left or right with four fingers on your trackpad.

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Exit Split View

  1. Move the pointer to the top of the screen to reveal the window buttons.
  2. Click the full-screen button in either window. That window exits Split View.
  3. The other window switches to full-screen view. You can switch to the full-screen window with Mission Control, or use a Multi-Touch gesture such as swiping left or right with four fingers on your trackpad.