vor den Fußnoten und nach dem trenner ist eine Zeile zu viel.

Switch to Draft View and then click on Show Notes in the Footnotes section of the References tab of the ribbon and then from the dropdown in the Footnotes header bar, select Footnote Speparator and then with it selected, go to the Format Paragraph dialog and change the indent as required.

You may want to do the same thing for the Footnote Continuation Separator.

https://answers.microsoft.com/en-us/msoffice/forum/all/moving-the-footnote-separator-line/44347439-901a-430d-b5e6-b93859e12a47