When editing the format of table of contents , there is a button named "Alle" in German UI. The help file says clicking it would apply the changes without closing the dialog. This is only a part of the truth: Actually it applies the current format to all levels (and it does not close the dialog, of course).
It is not a problem of translation, but the English text has the same shortcoming. "Applies the current settings without closing the dialog." The text - which is used as extended tip - does not mention, that the setting is applied to all levels. Suggestion: "Applies the current settings to all levels. Does not close the dialog." The text is in text\swriter\01\04120221.xhp <paragraph role="paragraph" id="par_id3155137" xml-lang="en-US" l10n="CHG" oldref="37"><ahelp hid="modules/swriter/ui/tocentriespage/all">Applies the current settings without closing the dialog.</ahelp></paragraph>
Adolfo Jayme Barrientos committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/help/commit/?id=005b4a65cdb91fe7566207b9e4c0b4125bf0e133 tdf#103540 Explicitly say the button affects all levels