This indicator is intended to be used while using Replay Mode.
It is similar to the built-in Session Breaks, but has the benefit of not needing to remove one candle before checking the Daily.
When on an intraday chart (timeframe less than Daily), a vertical line will be drawn when you can safely check the Daily or Weekly candle without seeing future price.
When the line is the color of your Daily settings, it is safe to check the Daily candle.
When the line is the color of your Weekly settings, it is safe to check both the Daily and Weekly candle.