Archiving removes a pitch from the primary pitches view while retaining its press list, templates, and message history. Keep pitches active when you expect to search or copy their press lists frequently.
Open Pitch Settings from the pitch menu
Open the pitch. Select the three-dot menu in the upper-right corner, then select Pitch Settings.

Archive or restore the pitch
Select the red archive button on the settings page.

An archived pitch remains available from Recent Pitches on the home page. To restore it, return to its settings and select Un-Archive.