Form personalization push button displayed false issue

I am trying to hide supplier button on RFQ from attached to purchasing , I am done with that using form personalization setting the displayed property to false, when I I click apply I can see the supplier button hide at the same time but when I exit the form then open the form again the supplier button is still visible when I check on validate button or get value it by default gives true (displayed true) , what can I do to set this property false to hide supplier button ??

Target Item: PO_CONTROLS.SUPPLIERS

Property: Displayed

Value: FALSE

Thanks in advance