Hello Peter,
Thank you very much for your answer!
1- This point is fixed, thanks 🙂 I did it in CSS because I don't know how to use a hook...
2- I tried to add status="draft" but it doesn't seem to be taken into consideration (I put it on the submission page shortcode, not on the user dashboard one. Is that right?) and unless I'm mistaken, I didn't find this parameter in the documentation.
3- (only for confirmation, because the user will not be able to delete) The shortcode used is :
[mb_frontend_form id="caractnendo" post_type="nendoroid" post_fields="title, thumbnail" confirmation="Votre contribution a bien été envoyée. Elle sera prochainement vérifiée puis validée. Accédez à vos contributions en <a href="/dashboard">cliquant ici</a>." label_title="Titre" label_thumbnail="Photo principale"]
And the result is: https://zupimages.net/viewer.php?id=22/46/ieel.png
I also tried without the a href tag, and the result is the same.
Thanks for your help!