The Zoom In command increases the magnification of the image. The command scrolls the window to keep the point of interest centered. To zoom in, click View | Zoom | In, and then click on the area on which to center the magnified image. Click on another tool button or press the ESC key to end zoom mode.
You can use a wheel mouse to zoom in/out and pan in the plot window. Zooming with the mouse wheel zooms in to or out from the cursor location. Rotate the wheel forward to zoom in, or rotate the wheel backward to zoom out. Hold down the wheel button straight down, and the cursor will turn to a closed hand. When the cursor is a , drag the mouse to pan the plot window. Be sure to click straight down with the scroll wheel. The zoom is changed so that the cursor location remains on the screen.
You can use keyboard commands to zoom in and out of the plot window. The default commands are CTRL + = to zoom in, and CTRL + - to zoom out.
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View Tab Commands - Plot Window