If you're looking to simply run a crowdfunding campaign and don't want the Join the Campaign button and fundraiser section displayed on your site, you can easily turn of the Peer-to-Peer Fundraising feature.
To turn off peer-to-peer fundraising, follow the steps below:
Step 1: Under Campaigns, select the Settings of the campaign you wish to edit.

Step 2: Under Fundraising Website >> Personal Pages, select General Settings.

Step 3: Turn off Enable Personal Pages.

Additional Notes
Now peer-to-peer fundraising features will not appear on your site.
We typically recommend using peer-to-peer fundraising on almost any campaign, since campaigns with peer-to-peer fundraising tend to raise twice as much as those without, since it provides the opportunity for your fundraisers to raise funds on your behalf and extends your campaign's reach.