When drawing the RSI, I am thinking of drawing the 25% and 75% horizontal lines. With automatic range adjustment, the 25% line is displayed as a separate axis on the right side from 20 to 30. I can use ylim=() to adjust the range and it works fine, but it still doesn't combine the 75% on the left side with the RSI axis, and the scale is displayed on the right side, which is not smart. Is there a better way to do this?
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Are you using hlines or mpf.make_addplot() to draw your 25% and 75% lines?
It sounds like you are using mpf.make_addplot() (otherwise the hlines would be drawn on the same axis as the prices).
If so, when calling mpf.make_addplot() use kwarg secondary_y.
As explained between cells In [15] and In [16] in the addplot tutorial ...
mpf.make_addplot() has a keyword argument called secondary_y which can have three possible values: True, False, and 'auto'.
'auto' which means if you don't specify secondary_y, or if you specify secondary_y='auto', then mpf.plot() will attempt to decide whether a secondary y-axis is needed, by comparing the order of magnitude of the addplot data with the order of magnitude of the data that is already on the plot.mpf.plot() gets it wrong, you can always override by setting secondary_y=True or secondary_y=False.