J'étais able to get rid du bouton like this:
Modification : This fonctionne instantly, but the clé is recreated après redémarrer. Vous pouvez prevent this by denying write autorisations vers le clé:
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In the left pane, clic droit sur le OneDrive clé and ensuite click Permissions. In the dialog click Advanced.
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Add a nouveau access entry for utilisateur Everyone of tapez Deny. Under Advanced Permissions just sélectionner Set Value.
Only other solution for me was uninstalling OneDrive. The option 1 by @cam-ashton ne seem to work avec latest Windows 11 (23H2) anymore.