Yes. You can opt out of Publisher Pitches entirely in your company settings.
Turning off pitches vs turning off emails
These are different settings. Switching off Publisher Pitches opts your brand out of being available to pitch. Turning off Publisher Pitch Activity notifications only stops the emails about incoming pitches; it doesn't switch Publisher Pitches off.
If you want to keep receiving pitches
Leave Publisher Pitches switched on and manage your Publisher Pitch Activity notifications under Account → Notifications. You can also check Awaiting Acceptance in your dashboard for pitches that still need a decision.