all the icons are on at the same time

Hi,all
1.Create a new Calc document
2.View->Toolbars->Form Controls
3.Design MOde On/Off->Check Box->Text Box->Push
Button->List Box->...
4.You can find that all the icons are on at the same time.
5.There is no such phenomenon in Writer.
Is this a bug?If it is,how to fix it?Please elaborate on it.
Thank you!

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