Hello Tristan, welcome to the community!
Looks like you are enrolled in Trello's Personal Productivity Beta phase. This is an open beta program for users to use and test out all the new features and changes we're working on to bring a new Trello experience to our users.
Trello's card back was redesigned with the intent of improving the visibility of relevant information on the card, as well as its usability, by reducing the screen clutter that was caused by multiple actions, many of which were rarely used.
We're actively gathering feedback about this change, which you can share by clicking the "
Share feedback" button at the top right corner of the card back. When you provide feedback through this button on the card, it reaches our Product team directly. I have attached a screenshot for better visibility.

Additionally, if you're unhappy with this change, you can also go back to the original experience by exiting Open Beta. For that, click the "Beta" button on the Trello header, next to the search bar, and then click "Exit Beta".

I hope this helps.
Thank you
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