The HangingIndent command was created recently and it is used in the Writer sidebar, but I can find no documentation about it: https://cgit.freedesktop.org/libreoffice/core/commit/?id=c1351a7b1363dac4349f37ac8876fdf950e62b97
Setting to NEW...
I am willing to add something to help, but cannot find any relevant information from the source code or from experimenting with the command. Here is patch: https://gerrit.libreoffice.org/c/core/+/35930/ No indication of tdf bug #. Not mentioned in release notes. Could not see a "tooltip" in source code. Does not seem to appear in Sidebar at present (7.1.0.0, 6.3.6.2), and does not seem to be included in any toolbar. After adding to toolbar, could not get any noticeable change from clicking on icon. There are help pages about making hanging indents: https://help.libreoffice.org/7.1/en-US/text/swriter/guide/indenting.html and https://help.libreoffice.org/7.1/en-US/text/shared/01/05030100.html but they do not address this command.
1. Set First line Indent greater than zero. 2. click on Hanging Indent icon in toolbar. Result: Can exchange (back and forth) values for "left indent" and "first line indent". Purpose? Useful for?
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/8dd6a6bb91cc620e33a9927293d9723876d50344 tdf#113804 add explanation about Hanging Indent .uno
When the online help is updated from master (in a few days), then it should be possible to see help for "Hanging Indent" at: https://help.libreoffice.org/7.1/en-US/text/swriter/guide/indenting.html Closing as FIXED