When fundraising page signups are disabled, the "Join the Campaign" button is removed from your campaign site, but your existing peer-to-peer fundraising pages continue to be displayed.
Here's how you can disable donation for your campaign.
Step 1: Navigate to your campaign, and go to Settings > Peer-to-Peer Fundraising.
Step 2: Switch off "Enable Signups" and save.
Now, you can keep your existing peer-to-peer pages active and no new peer-to-peer pages can be created on your campaign.