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You can delete a custom link by clicking the trash icon at the end of the line. This will open a popin asking for confirmation. Once confirmed, the link will be deleted and a notification will appear.
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Configuration for versions prior to 2023.3
See more about configuring the menu links for for versions prior to 2023.3 WEDIA Release.
➡️ https://crossmedia.atlassian.net/wiki/spaces/WD/pages/2098430016/Homepage#Footer-area