You can use the ribbon command References | Footnote | Footnote options 
to change settings for the footnotes in the current document.
It opens a dialog box with the following options:
Position
The footnote texts are usually displayed in the bottom margin of each page. Change the option Position if you want them to appear in a different location:
▪Bottom of page
| This is the default setting – the footnote texts are displayed at the end of each page. |
▪Below text
| The footnote texts appear directly below the text. |
Layout
If necessary, you can divide the footnote area into multiple columns, and the footnote texts are then distributed among the number of columns that you set here.
The default setting here is Use section layout. The division of the footnote area is thus automatically based on the column formatting of the text area in which the footnote is located. (For more information on sections, see What are sections?.)
Numbering
Here, you can make settings for the automatic numbering of footnotes:
▪Type
| Here, you can change the type of numbering. For example, you can also use letters in addition to numbers. The footnotes are then represented by A, B, C, etc., rather than by 1, 2, 3, etc. |
▪Start at
| Here, you can specify the number with which the counting should start. The default value is "1". If, for example, you enter "42", the first footnote will be given the number 42, the next 43, and so on. |
▪Mode
| Here, you can specify whether the footnote numbering should be reset to "1", for example, on each page or each chapter: |
| Continuous numbering: The numbering is never reset. This is the default setting. |
| Restart on each page: The numbering is reset to "1" at the beginning of each page of the document. |
| Restart on each section: The numbering is reset to "1" at the beginning of each section. (For more information on sections, see What are sections?) |
| Restart on each chapter: The numbering is reset to "1" at the beginning of each chapter. (For more information on chapters, see Dividing a document into chapters.) |
Separator line margins
Here, you can set the margins for the separator line that is inserted automatically above the footnote section:
The Top margin determines the minimum spacing between the text and the separator line, while the Bottom margin determines the spacing from the separator line to the footnote texts.
As you increase the Left margin, the separator line starts further to the right; as you increase the Right margin, the separator line ends earlier.
"Separator line" button
Click on this button if you want to change the appearance of the footnote line inserted above the footnote area.
For example, to change the thickness of this line, select the desired line thickness in Line style / Thickness.
If you don't want the footnote separator line to appear at all, select the option No line from the list Line style.
"Convert" button
If you want to convert all footnotes in the document into endnotes so that they appear at the end of the document by default, click on the Convert button. In the dialog box that then opens, you can make the desired adjustments.