Removing Records from the Competitors List
You cannot delete records that have been added to the Competitors list, since deleting them would also remove them from related screens, like Opportunities. For example, a company might have been a competitor for an opportunity last month. Even if the company is no longer a competitor, the competitor record must remain as part of the history of the opportunity.
If you no longer want a record to appear in the Competitor’s list, deselect the Competitor check box. This removes the record from the Competitors screen without affecting other screens.