Demande de conseils sur "Comment créer une bannière sur la page principale"

I want to create and apply such banner in our forum page as well,
is it a plug-in or any settings allowed for that?

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Hey, Moin. This does not contain any solution regarding the closable banner.
What you shared with me are not closable.

I was going to link the same topic. I believe that the banner you posted above is based off the theme component below.

Banner topics can also be closed and are pinned above all the content