Fresh installation

I want to set the featured image when creating a new post on the Admin Frontend.
When I installed wordpress I noticed that there’s a box to achieve this:

But when I try to do this now, I can’t find this box:

I can still set the featured image via REST-API, but I want to do this in the Admin Frontend too.

I already tried to deactivate all plugins – but that’s not the problem.
Did I accidentally change an option for this or why is this box disappeared?

Read more here: Set featured image on creating new post


Solution:

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