Navigating to: File -> Properties -> General and hitting "Help" at the button left corner launches this webpage: https://help.libreoffice.org/swriter/sfx/ui/documentinfopage/signature?Language=en-US&System=UNIX&Version=5.0 The fact is that the help content is written (https://help.libreoffice.org/index.php?title=Common/General_11) and just not linked properly. This is true for other tabs in the Writer's Properties dialog box window.
I confirm bug with LibO 5.0.2.1 and latest 5.1.0.0 daily build works fine in 4.4.5.1 hence 5.0.x regression to bibisect
Andras Timar committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=2f91170b8637554100e427525541ade2fd38c574 tdf#94473 add missing hid
Andras Timar committed a patch related to this issue. It has been pushed to "libreoffice-5-0": http://cgit.freedesktop.org/libreoffice/help/commit/?id=5f1e836c7d1356ad5c66e6bed1a5e2eeaeebe67d&h=libreoffice-5-0 tdf#94473 add missing hid
Migrating Whiteboard tags to Keywords: (bibisectRequest) [NinjaEdit]