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When using geometry and angles you need to lock the Time/Price Ratio in the bottom-right corner to keep the angles constant.
Note that if you use the Geometric Line tool (instead of the Trend Line) you will be prompted to lock the ratio when the tool is applied.
For more information and videos on using the Time/Price Ratio to scale charts see here: https://help.optuma.com/kb/faq.php?id=591