Regressions from work done by Michael Stahl on Redlines -> https://cgit.freedesktop.org/libreoffice/core/log/?qt=grep&q=sw_redlinehide
The feature moved out of experimental mode with the following two commits in 6.3 / 6.2: "sw_redlinehide: make layout based Show/Hide mode the default" 6.3: https://cgit.freedesktop.org/libreoffice/core/commit/?id=32902f66e7749b2d06d13f50416be5323a0c0ea9 bibisect-linux-64-6.3: commit 63dec39f2e1dab30a4c3ea8bdcea290600cf6983 Author: Jenkins Build User <tdf@pollux.tdf> Date: Tue Dec 18 22:07:56 2018 +0100 source 32902f66e7749b2d06d13f50416be5323a0c0ea9 6.2: https://cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-6-2&id=94c1af65367dcbc7272455cf6d4940252a289b62 bibisect-linux-64-6.2: commit ae82aa93d4536e9529688f412def4a23908f1d40 Author: Jenkins Build User <tdf@pollux.tdf> Date: Wed Dec 19 08:07:30 2018 +0100 source 94c1af65367dcbc7272455cf6d4940252a289b62 Even before experimental mode, earlier in 6.2 it was available by setting an environment variable. https://cgit.freedesktop.org/libreoffice/core/commit/?id=ae3150b1e1863e854224c2e41c7e50991f945dad "sw_redlinehide_2: replace SW_REDLINEHIDE with ExperimentalMode config" bibisect-linux-64-6.2: commit 4bbbfbcef6c5450afe0ce58b1cd5da3da04133ed Author: Jenkins Build User <tdf@pollux.tdf> Date: Wed Sep 19 22:08:58 2018 +0200 source ae3150b1e1863e854224c2e41c7e50991f945dad Talks: https://archive.fosdem.org/2019/schedule/event/are_we_optimiert_yet/ https://conference.libreoffice.org/assets/Conference/Tirana/AreOptimiertMStahl.pdf