Turn missed recent calls from red to black to keep record without distracting red.

Missed recent phone calls are shown in red, which is fine as a way to draw attention to them. However, the only way I see to get rid of the red once I have seen the missed call is to delete it, and I don’t want to do this as I want to keep a record of missed calls for a few weeks. Does anyone know of a way to do this?

thanks