Choose Format - Arrange - Send to Back (LibreOfficeDev Writer, LibreOfficeDev Calc).
Choose Shape - Arrange - Send to Back (LibreOfficeDev Draw).
Sayisi+HajajoCtrl+xeisi malaatisi (LibreOfficeDev Kisi, LibreOfficeDev Misile)
Open context menu - choose Arrange - Send to Back (LibreOfficeDev Impress).