Question: How to get predictable results when clicking a triangle?

Trying to read the docs, I find a lot of information in section that appear closed, and I'm supposed to move my hand from the keyboard to the mouse to bounce a laser off my desk to click triangles on the screen to make the information I need visible. Sometimes when I click a triangle, it opens the section and lets me read the docs. Other times I click a triangle, it does nothing, so I click again, and eventually it works. This process is unpleasant. Is there any way predictable way to view the docs, or just click triangles and hope?

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