If you want to remove a form, poll, or list embed from your website, you can do one of two things.
First, you can just remove the embed code from your website. This is the most "hygienic" approach, as it's a best practice to not leave old Javascript lying around for your visitors to have to load.
But we recognize that it isn't always practical to wait for your web team to remove old code from multiple places. In those instances, you can archive a form, poll, or list embed by navigating to the Forms, Polls, or List Embeds page, hovering over the embed you want to archive, and selecting Archive.
Archived embeds will no longer display on your website—though, depending on how you embed your embeds, their containers probably will, leaving a small empty space where the embed used to be.
Before:
After archiving the embed: