Zoom In - Grid Editor
Click the Grid Editor | View | Zoom In command or the 
button to immediately increase the magnification of the grid editor.
Zoom with A Wheel Mouse
You can use a wheel mouse to zoom realtime and pan in the plot window or grid editor. 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.
Zoom with the Keyboard
You can use keyboard commands to zoom in and out of the plot window. The default commands are CTRL+EQUAL SIGN (=) to zoom in, and CTRL+HYPHEN (-) to zoom out.