Open LO. Go to Tools → Options → LibreOffice → Base → Connections. Press "Help". Help couldn't be found, because the link is wrong. Searching for "Connections" will show the page. The following data could be helpful in locating the error: Help ID: cui/ui/connpooloptions/ConnPoolPage This error appears in LO 7.3.3.1, also earlier versions of LO. Tested with OpenSUSE 15.3 64bit rpm Linux.
Confirmed with: Version: 7.3.4.2 (x64) / LibreOffice Community Build ID: 728fec16bd5f605073805c3c9e7c4212a0120dc5 CPU threads: 4; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win Locale: en-US (fr_FR); UI: en-US Calc: CL
Alain Romedenne committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/e9d5f04452ea8747348da648212681b4ec46ee15 tdf#148611 Base help page link is missing or incorrect