hide TYPO3 content plugin title (header) in fluid_styled_content

TCEFORM.tt_content {
    # disable header layout, but keep it for plugins
    header_layout.disabled = 1
    header_layout.types.list.disabled = 0
    # only keep "standard" and "hidden"
    header_layout.removeItems = 1,2,3,4,5
 
    # ajust the label
    header.label = Bezeichnung im Backend
}