Change Dock preferences on Mac
On your Mac, use Dock System Preferences to change the size of the icons in the Dock, reposition or hide the Dock, and more.
To change these preferences, choose Apple menu 
> System Preferences, then click Dock.
Size | Drag the slider to change the Dock size. |
Magnification | Magnify icons when you move the pointer over them. Drag the slider to choose the magnification size. |
Position on screen | Choose to locate the Dock along the left, bottom, or right edge of the screen. |
Minimize windows using | Choose the visual effect used when you minimize a window. |
Prefer tabs when opening documents | Choose when you want documents to open in a tab (instead of in a new window): always, only when you’re working in full screen, or manually (only when you open a document that way). |
Double-click a window’s title bar to | minimize: Minimize an app window to the Dock. zoom: Expand a window to fill the space between the Dock and the menu bar. If the Dock is along the side of the screen, the window fills the space below the menu bar and to the side of the Dock. |
Minimize windows into application icon | Minimize an app window to the app icon in the Dock. If the option is deselected, the window is minimized to an area in the Dock. |
Animate opening applications | Make icons bounce when you open apps. |
Automatically hide and show the Dock | Hide the Dock when you’re not using it. To see the hidden Dock, move the pointer to the edge of the screen where the Dock is located. |
Show indicators for open applications | Show a small black dot below an app’s icon in the Dock when the app is open. |
Show recent applications in Dock | Show recently opened apps (if they aren’t already included in the Dock) toward one end of the Dock. |