https://wccftech.com/chrome-for-android-is-testing-new-ui-for-downloads-panel-and-bookmarks/

Ever since the announcement of Android 12, Google has been hard at work when it comes to updating the stock apps to the latest Material You design, and the latest change that has taken place is in Google Chrome for Android. The app first received dynamic theming support earlier this month, and Google is currently testing the design changes in the browser that will make the downloads panel and bookmarks a modern look.

Google Chrome for Android's latest design refresh gives a completely new look to the downloads panel. Instead of the grey pop-up at the bottom, current downloads are displays as a toast at the top of the screen in the new design. In addition to that, complete downloads also appear in the same location in a rounded card with the "Open" button.