The you will have to drawn as many new rectangles (and delete the old ones) as new candles are appearing on the chart up to that time limit. Rectangles cannot 'grow'. They need to be deleted before the new updated one is plotted on the chart.
HI. I know in the one time finally Buffer is set. you should find that time is when. if your indicator is very changeable I advise to you just remove this indicator. some indicator not suitable for EA.
you should check the indicator on the backtest and see exactly how many candles need to check
@sjthetechguy Look at the 'Output buffers' below. Colours are not visible. This means fxDreema cannot identify them correctly. You'll need to create them manually as explained in this tutorials: