If you’d like to apply a change to all of your videos at once, visit the Upload defaults tab in your Account Settings, adjust your default settings, then check the box that says "Also apply to all existing videos" before saving your changes.
You can change the settings for a handful of specific videos at once on your Video Manager: vimeo.com/manage/videos. Select the videos you want to change, click Privacy, Collections, or Delete from the menu on the top right, make your changes, then hit save. You can also use your Video pages to delete a specific subset of your videos.
If you’re looking to apply the same set of embed settings to a group of videos, learn more about using embed presets.
Please note that if you make any changes to a video's privacy in an app (such as the Mevo app, Final Cut, iMovie, or the Vimeo app itself) that allows you to upload to Vimeo from a source other than Vimeo.com, any upload default settings you've set for your videos will be overridden. Any setting that is changed in an external app will take precedence over the upload defaults in the user's account settings.