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How can I remove shortcut directory bookmarks in home screen ?
I follow the steps here and "Contrato Carlos" was not there to be removed.
In your case just click Desbloquear do lançador (Unlock from launcher). In Ubuntu >= 18.10 it's rather Remove from favorites. Keep in mind that it will be still visible on your dock while it's opened.
Desbloquear do lançador
Remove from favorites
Required, but never shown