ReferenceLine:Hardcoded: x with symbols

Build 908 on feat/dropdown-overhaul
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Baseline History
Build 9087754ff6
Current build. There are unaccepted changes, so build 325 is still the baseline.
Build 325ee8f135 current baseline
Accepted by Zach Stence.
Build 308f94e6d4
Accepted by Archie Sarre Wood.
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