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Nintendo patent explains Switch 2 Joy-Cons’ “mouse operation” mode
(arstechnica.com)
This is a most excellent place for technology news and articles.
I think it has normal mouse sliders. There's a thicker black line in figure 25 behind the line with number 33.
Good eye. Looking into it further, it looks like this picture seems to suggest that they've forseen this issue and will also provide an attachment for a better "mouse mode" experience.