You can use ZOOM command to zoom in or zoom out the drawing view to meet your need. ZOOM does not change the absolute size of objects in the drawing; it changes only the magnification of the view.
With this zooming feature, you can change the magnification of your drawing at any time. The cursor changes to a magnifying glass when a zoom tool is active. Zoom out to reduce the magnification so you can see more of the drawing, or zoom in to increase the magnification so you can see a portion of the drawing in greater detail.
NOTE If you are working in a layout viewport and cannot zoom, the layout viewport may be locked. The scale and view do not change in model space while panning or zooming in a locked layout viewport.
Zooming in and out
One of the easiest ways to change the magnification of the drawing is to zoom in or out by a preset increment. On the Zoom toolbar, the Zoom In tool doubles the current magnification of the drawing. The Zoom Out tool reduces the magnification of the drawing by half. The portion of the drawing located at the center of the current viewport remains centered on the screen as you zoom in and out.
To zoom, you can use any of the following methods:
To define the portion of the drawing to zoom, create a window.
To zoom in real time, press Ctrl +hold and drag the left mouse button, or use the Real-Time Zoom tool ( ) on the standard toolbar.
If you have a mouse with a wheel, rotate the wheel to zoom in and out.
Zoom to Magnify a Specified Rectangular Area
You can specify a rectangular area defined by two corners to display the objects within that area as large as possibly.
The lower-left corner of the specified area becomes the lower-left corner of the new view.
To zoom in to an area using a window
Choose View > Zoom > Window.
Select one corner of the window around the area you want to magnify.
Specify the opposite corner of the window around the area you want to magnify.
Command line ZOOM
To specify a rectangular window around the area you want to magnify, select first one corner(A), and then select the opposite corner (B)
Zoom in Real Time
With the Realtime option, you zoom dynamically by moving your pointing device up or down. By right-clicking, you can display a shortcut menu with additional viewing options.
To zoom in real time
Choose View > Zoom > Realtime.
Hold the Ctrl and the left mouse button, then drag the cursor.
To zoom in, move the cursor up the screen; to zoom out, move the cursor down the screen.
To stop zooming, release the mouse button.
Command line RTZOOM
To zoom using a mouse with a wheel
Each rotation of the wheel away from you zooms out .8 times; each rotation toward you zooms in 1.25 times.
Displaying the previous view of a drawing
After you zoom in or pan to view a portion of your drawing in greater detail, you may want to zoom back out to see the entire drawing. On the Zoom menu, the Zoom Previous tool lets you restore the previous view. Selecting this tool repeatedly steps back through up to 25 successive zoomed or panned views.
Zooming to a specific scale
You can increase or decrease the magnification of your view by a precise scale factor measured relative to the overall size of the drawing or in relation to the current display. When you change the magnification factor, the portion of the drawing located at the center of the current viewport remains centered on the screen.
To change the magnification of the view relative to the overall size of the drawing, type a number representing the magnification scale factor. For example, if you type a scale factor of 2, the drawing appears at twice its original size. If you type a magnification factor of .5, the drawing appears at half its original size.
You can also change the magnification of the drawing relative to its current magnification by adding an x after the magnification scale factor. For example, if you type a scale factor of 2x, the drawing changes to twice its current size. If you type a magnification factor of .5x, the drawing changes to half its current size.
To zoom to a specific scale relative to the current display
Do one of the following:
Type the scale factor, followed by an x (such as 2x).
Command line ZOOM
Combining zooming and panning
With the Center option, you can scale objects and specify a new view center. You can specify the scale factor relative to paper space unit or to the current view.
To change the center of the current view
Choose View > Zoom > Center.
Select the point you want located at the center of the new view.
Specify the zoom scale factor or the height of the drawing in drawing units.
Command line ZOOM
Current view(left) showing the point to be centered in the new view (A), and the new view(right) zoomed using a scale factor of 2x
Displaying the entire drawing
ZOOM Extents displays a view that includes all of the objects in the drawing as large as possible. The view can display the objects on layers that are turned off but does not include objects on frozen layers.
ZOOM All displays all of objects within either the user-defined limits or the drawing extents, whichever view is larger.
You can use the Zoom All tool on the zoom toolbar to display an entire drawing. If you have drawn any entities outside the defined limits of the drawing, the extents of the drawing are displayed. If you drew all entities within the limits of the drawing, the drawing is displayed all the way to the drawing limits.
The Zoom Extents tool on the zoom toolbar displays the drawing to its extents, making the image fill the display to the greatest possible magnification.
Zoom extents (displays all entities)
Zoom all (displays to drawing limits)
ZOOM: Increases or decreases the apparent size of objects in the current viewport
System Variables Reference
EXTMAX: Stores the upper-right point of the drawing extents
EXTMIN: Stores the lower-left point of the drawing extents
RTDISPLAY: Controls the display of raster images during Realtime ZOOM or PAN
WHIPTHREAD: Controls whether to use an additional processor to improve the speed of operations such as ZOOM and PAN that redraw or regenerate the drawing
ZOOMFACTOR: Controls the incremental change applied by each mouse-wheel's forward/backward movement