All unread messages appear in the Unread email (a) view. After you read the email, they will remain in the relevant folders, e.g. Inbox. You can deactivate the Unread email view. You can mark all the important messages as favorites with a star. These messages will then appear in the Favorites (b) view. In the Unread email and Favorites views, your email are sorted by folder. You can deactivate sorting by folder.
GMX offers various views (c) for your mailbox:
By default, your email is sorted by date in descending order. You can use the Sort (d) button to select a different sorting method.
At the bottom of the list of email, you can scroll (e) through all the pages of your email if the number of email exceeds the amount shown on each page.