This web part is more a POC created for the SharePoint Hackathon 2025. This web part allows you to quickly add presentation mode to any page on your site. It has no UI and is not visible after publish, so not edit mode of the page. After adding it to a page and publishing it will add an additional Play in the page header.
Open this sample in the gallery (popup panel): Open in gallery
Source: https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/js-demo-time