Rightclick on the chart and then untick Show Objects – see first screenshot at the mouse, this is for V12.
In V11.1 it is what you see in the 2nd screenshot – that changes the choice from Show to Hide.
Whether this hides what you want ? I can’t tell. Maybe this is about self-drawn/put objects only.
PS: I added the menu from V11.1 in English – see 3rd attachment.