Documentation Link

https://matplotlib.org/devdocs/users/explain/axes/mosaic.html

Problem

Extracted from #25417 as the actionable way forward.

Suggested improvement

Add a new section on axis sharing to subplot_mosaic guide

This should have

• a simple example of sharing; e.g. "AC;BC", sharex=True
• an example like from [Bug]: subplot_mosaic bug with empty_sentinel and sharey=True #25417 ".A;BC", sharey=True, where the top row does not have ticklabels because the most-left is hidden and share removes the the ticklabels from all other. - Show this effect and explain how to manually add ticklabels to B (subplots["B"].tick_params(labelleft=True).