The current arrow vec/widevec is pointing at the right side, and we need an arrow that is reversed which points to the left side.
The Unicode U+20D0 COMBINING LEFT HARPOON ABOVE, or U+20D6 COMBINING LEFT ARROW ABOVE can be appended as a literal via <Alt>+X toggle; but it is clunky. Some work to add to OpenSymbol font as was done for bug 120047 [1] for HARPOON and WIDEHARPOON at the 6.3 release. @Khaled, easy hack worthy? =-ref-= https://gerrit.libreoffice.org/c/core/+/72987/
Neil S Patel committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/2975a0bf9213c250f415de7544b3b83ad3b7cda5 tdf#158727 Support attribute leftvec leftharpoon in Math It will be available in 26.8.0. The patch should be included in the daily builds available at https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.