When editing text in the UI (e.g. Settings → User Data) and the font has ligatures for e.g. fi or لا, the cursor can’t be inserted inside the ligature. This does not happen when editing document text. It also depends on the font, since not all fonts have ligatures for these characters.
Khaled Hosny committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/commit/21013c4662a9ab32d293de263c54ebeceb66828c tdf#156377: Improve cursor traversal in UI widgets It will be available in 24.2.0. 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.