It is an indicator that displays the trading volume.
Red-colored candle bars indicate a decrease in trading volume.
Green-colored candle bars indicate an increase in trading volume.
The transparent yellow cloud above the volume bars represents the 21-bar moving average volume, which shows the average volume over the specified period. (You can change the number of bars and the type of moving average from the indicator settings.)
This allows for easier comparison between the current trading volume and the average volume.
In the price scale section, there are 4 target levels. They represent the following in ascending order: Average volume, Average volume multiplied by 2, Average volume multiplied by 3, Average volume multiplied by 4.
Additionally, you can use the alarm feature based on these average volume levels.