If you'd like to prevent your fundraisers from editing their share details including the share image, title, and description, you can overwrite their permission.
When you overwrite their share settings, you will apply the main campaign share settings to all of your personal pages' share settings and your fundraisers will not be able to edit the details.
To overwrite the personal page share settings, follow the steps below:
Step 1: Under Campaigns, select the settings of the campaign you wish to edit.
Step 2: Under Sites & Forms, select your site.
Step 3: On the left navigation, under Personal Pages, select General Settings and toggle on Overwrite Peer-to-peer Share Settings.