To view the Campaign Influence related list, the following permissions are required: 'Read' on Campaigns and 'Read' on Opportunities.
The Campaign Influence related list also needs to be added to the Opportunity page layout, since it is not part of the layout by default.
Sometimes a user has these permissions and the related list has been added to the page layout, but the user still cannot see this related list.
This article explains how to fix a Campaign Influence related list that does not appear on the Opportunity page, even when permissions and the page layout look correct.
You need to ensure that the related list is first added to the page layout. The page layout set by the administrator should either override the user's personal setting, or the user's personal setting must contain the related list.
Steps to check the Personal Settings of a user to see if the related list is added:
For example, if an admin adds Campaign Influence to the org-wide Opportunity page layout but a sales rep still can't see it, checking that rep's personal 'Customize My Pages' settings often reveals the related list was removed there individually.
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