Reducing the number of labels on MS spectra

In The Assign Tab, in the Spectra window, it would be nice to have the monomer contribution appear only if different than 0.
Example here of B in green. To reduce the number of labels it would be nice if A0, B0, C0, etc. would not appear.

Start by locating the rendering entry point for the Assign Tab's Spectra window and trace how monomer contribution labels are produced. Confirm the requested behavior with the attached example: zero-valued labels such as A0, B0, and C0 should be omitted while nonzero contributions remain visible.

Written by the indexing model from the issue text.