Choose Format - Arrange - Bring to Front (LibreOfficeDev Writer, LibreOfficeDev Calc).
Choose Shape - Arrange - Bring to Front (LibreOfficeDev Draw).
Maj+ OrdreCtrl++signe (LibreOfficeDev Impress LibreOfficeDev Draw).
Open context menu - choose Arrange - Bring to Front (LibreOfficeDev Impress).