Disable combobox/dropdown/datacardvalue control in powerapps sharepoint list form

Question

On combobox data card value selected disable combobox control in powerapps sharepoint list form.

In Powerapp designer we can see that DisplayMode property is disable.

I also add screenshot, which shows that don't know why we can set DisplayMode for combox control in powerapps form where we can do this for textbox. I need to disable combobox on form if yes is not selected in combobox or no value is selected

Thanks in Advance.

Answer 1

As replied in comment by Carlosfigueira, we can disable control, first we have to unlock the data card