open styles gallery (F11) and click on the ? icon - 3d in the top-right corner, the result is 404 error while trying to open file:///C:/Program%20Files/LibreOffice/help/en-GB/text/shared/05/err_html.html?System=UNIX&DbPAR=WRITER&HID=SIDEBAR_STYLELISTDECK in a browser (UNIX? As you can see from the URL this was on windows). Local help is installed and opens on F1. Linux 7.6.4 doesn't have this ? icon at all at least on KDE, so it is either windows-specific or 24.2-specific.
Created attachment 192936 [details] Bug 159841
Thank you for reporting the bug. I can confirm that the bug is present in LibreOffice 24.2.1.2 (x86_64) Please find the attached screenshot for reference.