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Hi, @eeroso
Based on my research, it is unsupported to scale the two y-axes proportionally. The 'Start' and 'End' of two y-axes is auto by default. You may midify it manually. There is no setting to scale them proportionally.
I'd like to suggest you post a new idea in Idea Forum and add your comments there to improve Power BI for making this feature coming sooner.
Best Regards
Allan
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.
@eeroso , You want one line on the primary Y-axis. I doubt there is an option for that as of now
You can suggest an idea for that https://ideas.powerbi.com/ideas/
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