Why do I need the “Scale Tool” setting in MoonBot on the Settings Interface tab?

In MoonBot on the tab Settings – User Interface there is a setting “Scale Tool”, if checked, it will show in the area of the stack under the cursor line the distance in percent between the spread and the cursor. This is a convenient tool to quickly check the distance to limit orders in the order book, or how much % was the price drop or rise from the current spread.