Choose Format - Arrange - Bring Forward (LibreOfficeDev Writer, LibreOfficeDev Calc).
Choose Modify - Arrange - Bring Forward (LibreOfficeDev Draw).
ComandoCtrl+segno più (LibreOfficeDev Impress, LibreOfficeDev Draw)
Open context menu - choose Arrange - Bring Forward (LibreOfficeDev Impress).