The first period of the indicator is the so-called „Range Period“.
This is the most important period of the indicator, because in this time the range is formed.
The range period is basically the dynamic range of the indicator which grows with the price movement. During this time, the range is made up of the highest and lowest prices.
You just need to set the start and end time when the indicator should form the range and the indicator does that for you every day.
Another highlight in this period is the range marking. This is of course also dynamic. This means that only the background of the range is highlighted and you always have an overview of the range at a glance.