when I try to model from tutorials the instructors' topology will show on both sides of a mirrored object, and won't be as hidden with gray in areas. I can't figure out how to set that up. 
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you've got to enable this display method in the mirror modifier by hitting this small icon:
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1$\begingroup$ Also, is there a way to see the vertices through the gray mesh? Quite a few of them get hidden by gray blotching when I model. Thank you so much for your help! $\endgroup$ – Eileen Massarello Jan 24 '19 at 4:30
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$\begingroup$ Yes of course! :) i.stack.imgur.com/tHnwg.png Just press this small button and x-ray is enabled. $\endgroup$ – Chris Jan 24 '19 at 11:20
