Collapsable headers?

[geolectric]

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I have a menu with multiple headers and under each header are a lot of selections, and this makes the menu very long. Is there a way to have the headers be collapsable? So, the headers would start collapsed, and then you could click the header to expand it and make the selections?

Is there an easy way to do this?

[nonprofittechy]

This is a feature of https://github.com/davidstutz/bootstrap-multiselect but that library hasn't been updated to Bootstrap 5 and is somewhat buggy. I would also be interested in this addition.