Shading the area between Bollinger Bands provides a different look that some people may prefer to the default lines. This tutorial shows how you can create those shaded bands.
Click on the green arrow on the right side of the “Overlays” section to expand. Skip to the next step if this is already done.
You can also use multiple shaded Bollinger Bands on a chart to find what parameters best fit your style of trading. This blog article from Chip Anderson goes into more detail. To add multiple bands, repeat the process outlined in Step 2.