When a customer spends more than a certain time (usually 15s) in a specific category, we consider him to be engaged. We know that the more time customers spend in a store, the more money they will spend, so taking into account this, the objective is to make customers spend as much time as possible in stores.
However, we must bear in mind that high rates are not always a good indicator, since this might mean that customers do not understand a product. Hence, it is advisable to do benchmarking with similar stores in order to identify which are the average rates and adapt our strategies consequently.