Support and resistance levels are derived from the trades heatmaps. They show you levels with the largest traded volume in current date range. Unlike volume profile, S/R levels don’t aggregate volume and don’t sum volume points on the same price level. They can help uncover hidden orders.
The number of S/R levels in the settings panel defines how many levels to show, starting from the largest traded volume
S = decrease number of S/R levels
R = decrease number of S/R levels
Clusters of several important S/R levels works well as important support/resistance zones..