I read this:
https://www.jetbrains.com/clion/help/folding-and-expanding-custom-blocks.html
and tried following this link:
https://www.jetbrains.com/clion/help/Folding_Custom_Regions_with_Line_Comments.html
but it appears to be broken, since it redirects to "Meet CLion" page.
How do I define custom folding regions in CLion using comments?
CLion is based on IntelliJ IDEA, and thus supports multiple ways, including:
//region Description
//endregion
and
//<editor-fold desc="Description">
//</editor-fold>
These can be easily accessed by selecting the code you wish to wrap in a region, and hitting Ctrl+Alt+T. You can alternatively access it by clicking Code > Surround with... in the menu bar.