The Collections tool in Microsoft Edge is being retired, and users will soon be unable to add new items to it. They are advised to export their saved content or transfer pages to Favorites before the feature is removed. Transferring to Favorites will result in the loss of additional content like images and notes, while exporting will preserve content in a CSV file but will not keep it within the browser. Collections has not gained significant traction among users, leading to its phased-out status. Additionally, the Edge Sidebar app list is also being retired, raising concerns about the future of the entire Sidebar feature as Microsoft aims to simplify Edge and promote Copilot.