Plots > 3D Plots > To Toggle a 3D Plot Perspective View
  
To Toggle a 3D Plot Perspective View
By default, the plot is displayed in perspective, appearing as if viewed from a certain distance.
1. Select the 3D plot region that you want to format.
2. On the Plots tab, in the Styles group, click Perspective to toggle the perspective view off.
Additional Information
The Perspective button is enabled by default and applies to each 3D plot that you insert.
You can disable the Perspective button in a new worksheet, and perspective is turned off for each inserted 3D plot.
To toggle perspective for a particular 3D plot without affecting other 3D plots in the worksheet, select the plot and click the Perspective button.