Thank you for providing feedback on the new Outlook on the web experience. This is our new Outlook and there are some changes regarding how flagged messages are shown on the screen. If you need to see all your currently flagged messages together, you can click on the "All" button on the top of the message list and then click on the "Flagged" option. This will filter your message list such that only flagged messages are shown. If you want to ensure that these messages are always pinned to the top of your message list, you can click on the 'pin' icon that you can find on the message list itself. After you do this, you can go back to the "All" view and all your pinned items will be kept on the top of the list.