Send to Back
Moves the selected object to the bottom of the stacking order, so that it is behind the other objects.
Choose Format - Arrange - Send to Back (Collabora Office Writer, Collabora Office Calc).
Choose Shape - Arrange - Send to Back (Collabora Office Draw).
Mayús++signu menos (Collabora Office Impress, Collabora Office Draw)
Open context menu - choose Arrange - Send to Back (Collabora Office Impress).
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