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In the last version of Mathematica (12.2), some genius on Wolfram thought that is was a good idea to change the keyboard shortcut Ctrl+4, that have been there for years, so now users get a (broken) box to input TeX (doesn't work in my system) instead of an underscript.

It's possible, but really annoying, to enter underscripts entering an overscript (Ctrl+7) and switching to underscript (Ctrl+5), then deleting the overscript.

This change also breaks the documentation of Underscript, by the way.

Is there a way to configure the notebook and remap the shortcut to the older one?

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In Mathematica 12.2 the way to enter underscripts is Ctrl+Shift+, (comma). At least on macOS.

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  • $\begingroup$ Thank you! That works for me, too (in Windows 10). I guess now i only need to fight the muscular memory from years of using ctrl-4 🤦‍♂️ $\endgroup$
    – jjagmath
    Dec 21, 2020 at 16:29
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    $\begingroup$ @jjagmath This is mentioned in Incompatible Changes since Mathematica Version 1, but WRI seems to forget to update the document page of Underscript $\endgroup$
    – xzczd
    Dec 22, 2020 at 5:27
  • $\begingroup$ @jjagmath Just found the document of Underscript has been updated, not quite sure when it happened, though. $\endgroup$
    – xzczd
    Jun 20 at 16:05

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