Viewport Navigation controls > Zoom
Keyboard > Z turns on Zoom; Keyboard > [ zooms in; ] zooms out
Zoom adjusts view magnification in the active viewport where you drag. By default, this button zooms in and out of the center of the viewport.
Tip: If you use the Microsoft IntelliMouse or a compatible pointing device, you can roll the wheel to zoom in and out in the active viewport. The zoom center is the current cursor position.
Procedures
To zoom a view:
Activate a Perspective or Orthographic viewport.
Click Zoom.
The button highlights when it is on.
Drag in a viewport to change magnification.
Drag up to increase magnification.
Drag down to decrease magnification.
Press ESC or right-click to turn off the button.
To increase zoom speed:
Hold down CTRL while you drag in a viewport.
To turn on an automatic zoom mode:
On the keyboard, hold down CTRL+ALT, then hold down the middle mouse button and drag in a viewport. This does not activate the Zoom button.
To zoom to the cursor position:
On the keyboard, press [ (left bracket) to zoom in, and ] (right bracket) to zoom out.