This is simple fair value gap indicator. It draws FVG (fair value gaps) as boxes. If FVG is partially filled, it is also displayed and smaller size FVG is drawn. If FVG is filled totally, it is deleted from chart. There is limitation of 500 drawing objects for indicators on Tradingview, so keep in mind that this indicator will display only last 500 FVGs.
For simplicity, there is only one setting, which is coloring of FVGs. It is perhaps a good idea to lower your opacity (to about 10%) and choose color of FVG according to your preferences and current theme (dark or white).