All content exported on Kapwing is Public by default, but by subscribing to Kapwing Pro, users can set their content to "Private". When a project is set to "Private", it will only be viewable by the creator. Links shared will lead to a 404 page.

I've upgraded, but how do I set my content to "Private?"

You can set your video to private on the download page by clicking "Make video private" or from your workspace by clicking the drop down menu under your project and selecting "Make private".