The STM32CubeIDE is based on an original, only slightly adapted Eclipse and therefore behaves largely the same. For the editor, Eclipse uses a default folding for C, which does not provide for folding for various elements, e.g. IF statements.
To activate it nevertheless, all you need to do in the menu is to activate the option Enable Folding of control flow statements (if/else ...) and make further settings if necessary in:
Windows > C/C++ > Editor > Folding
Please close existing editor windows and open them again to see the effect.
Good luck!
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/Peter
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