move a body feature using compass

I dont understand that some times i can manipulate the pad by using compass in part design
it just asks that do you want to make the sketch free
but sometimes it shows a message that some elements are fixed
why it is so
i mean how would i get to know that which features i can manipulate using compass

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I think when you draw a sketch,
you completely constrain it which means your sketch has a fixed position related to axes (like XY).
so in order to move the pad, try not to give dimensions related to axes.

 
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