When you have gridlines in a bar chart, you are able to enable both major and minor gridlines, but both are shown with the same gray color, so it would be ideal to use a lighter gray for minor gridlines to show a contrast between them.
ux-advise: Status -> NEW
Katarina took this one: https://gerrit.libreoffice.org/16819/
Katarina Behrens committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=701e21b25dda87a3f1feca1137c6ceab8a5363ab tdf#91725: Use lighter default colour for minor grid lines It will be available in 5.1.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Katarina Behrens committed a patch related to this issue. It has been pushed to "libreoffice-5-0": http://cgit.freedesktop.org/libreoffice/core/commit/?id=27c281770925786732acf4931ca13f7962dc2d32&h=libreoffice-5-0 tdf#91725: Use lighter default colour for minor grid lines It will be available in 5.0.1. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.