Choose Format - Arrange - Send to Back (LibreOfficeDev Writer, LibreOfficeDev Calc).
Choose Shape - Arrange - Send to Back (LibreOfficeDev Draw).
Shift + CommandCtrl + ๋นผ๊ธฐ ๊ธฐํธ(-) (LibreOfficeDev Impress, LibreOfficeDev ๋๋ก์ฐ)
Open context menu - choose Arrange - Send to Back (LibreOfficeDev Impress).