MS Word Line Numbering: how to change font size and type
You may have some pages in your document that use line numbering, In the dialogue that lets you apply this style (Page Setup > Layoyt > Line Numbers) there is no option to change the format of numbers.
The default format of Word line numbering follows the default paragraph style of the normal template. If your regular paragraphs use e.g. Times of 11pt, this will be also the format of line numbers.
To change this default line numbering format, open the Word Styles pane (Home > Styles) and locate the “Line Number” style. Right click to modify it. Even there, you won’t be able to get the numbering closer or even further away from the document’s text, only to change font size and style.