I want to mirror my interpolation mode, how can I do that?
What I want (white thick line)
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Open the N Panel in the graph editor and go to the F-Curve sub-panel.
Change the Easing Type of the left keyframe from Ease In to Ease Out.
Alternatively, while the left keyframe is selected, Right-Click > Easing Type > Ease Out.
Another solution, use the shortcut Ctrl + E > Ease Out while the left keyframe is selected.