XF 1.5 Where is the route filter?

#1
I've found a plethora of guides explaining how to use the route filter, but none of them mention where the feature is located in the first place. Yes, I know I'm terribly unobservant and I'm sure I'm missing something. But I've been searching for it long enough to get frustrated, and would be super appreciative if someone could just tell me.
 
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