When using footnotes in LO 7.0.5.2 (x64) build 64390860c6cd0aca4beafafcfd84613dd9dfb63a in Windows 10 Build 19042, on the pages prior to the last page, between the last line of text and the spacer above the first footnote on the page is enough vertical space for about 13 text lines. However, there is only one carriage-return line-feed below the last line of text and above the footnote spacer. The typical footnote is only one or two lines in length.
When printing or viewing the page, how may one reduce this vertical space to a negligible amount?