Use the Function Aggregation capability to identify the subset of functions to focus on and aggregate them into Function Groups.
To do this, select Advanced > Function Aggregation.
You can find the functions that are present in the trace file, but not in the function group, in the Other group. By default, the data for the Other group is displayed. To hide data for the Other group on the Quantitative chart, select Advanced > Show Function Group 'Other'.
Revert to the default aggregation in Advanced > Default Aggregation.