Basic attack range indicator

How do I make it so this is always on? I recently tried Kennen because of the free champ pool and fel in love, this champ is so insanely cool and versitle. He has an AP and on hit build so is really verstile, has good escape, super cool teamfighting and so on. But how do I make it so that I have my basic attack range inicator always on so I can actually start learning and memorizing his range. Hope someone can help me out here
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