The button "Edit axis, curve and image parameters" is not showing

I have version 3.5.3 of matplotlib. I am running that version of matplotlib in 2 different conda envs on same pc, and in one env it shows the button “Edit axis, curve and image parameters”
Whilst in the other it does not
(Also the location of the buttons in different, in one case it is on the top, in the other case on the bottom). What is controlling which buttons show up?

The location and which exact buttons are available on the toolbar are determined by which interactive backend is being used.

It is likely that e.g. one of your conda environments has qt (and a python binding like pyqt or pyside) and one does not (and is likely using tk)

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Thanks, installing PyQt5 on the second env made the Edit axis button appeared