The tracker gathers the trend of several assets in one place. Instead of opening one chart at a time, you quickly see which assets are rising, falling or directionless and use that to support your analysis.
The trend tracker is handy at the start of a session, when you need to decide quickly which assets deserve your attention. It saves you from opening chart after chart and gives an overview of the market.
In practice, the tracker saves the first half hour of the session. Instead of opening one chart at a time, you see at once which assets are well defined and which have no direction, and choose where to focus. This reduces the chance of entering sideways markets on impulse and helps maintain discipline, because the decision about where to trade is made calmly, before the pressure of an open market.