The Standard Deviation indicator measures the volatility of an asset's price relative to its average over a given period. It indicates how far price values deviate from the average itself on average: high values of standard deviation signal higher volatility (prices moving away from the average), while low values indicate lower volatility (prices staying closer to the average).
Clicking on the indicator settings icon will open its configuration window, within which you can make several choices regarding the indicator's functionality.
In the Parameters section you can set the indicator periods:
In the Subgraph section you can change the colors and style of the indicator: