You can let Match! calculate the residual peak intensities by selecting the Calculate peak residuals... command from the Peaks menu. The peak residuals are the remaining experimental peak intensities after subtracting the intensities covered by the identified phases.
A new dialog will open and display a table of 3 different peak intensities:
For each peak intensity type, the integrated counts as well as the relative amount is given.
The peak residuals can also be displayed at the bottom of the match list as well as the report.