When you use the intersection wizard you can lock the profile of the side roads to the crossfall of the through road. If the grip symbol is a paddlock it will be locked and you will not be able to move it therefore. to grade the side roads I normally to the following
If you really want to unlock the IP you can. Do the following. Select the profile right click->edit geometry->Profile Grid View->Scroll to the end and click the padlock in the lock column.
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