Tooltips were added to the Assign Style dialog in bug 129671, but "outline" should be "index" in the two tooltips for the two buttons under the Style window. Also, icons have been added to those buttons, which is not shown in the help page. https://help.libreoffice.org/7.6/en-US/text/swriter/01/04120219.html
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/f205cf12787f7a601a75a8acd4ddd13b064f686e tdf#154034 add icons and update procedure
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/311edc37b202f5463a86eddc1f9b476dbe5b47fa tdf#154034 correction to tooltips "outline" -> "index" It will be available in 7.6.0. 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.
Seth Chaiklin committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/82b298d6f35e25961a026d848238d29d6b373709 tdf#154034 remove xml-lang and use lc_ for icon