well, that depends on your version of LibreCAD.
In general, check Options > Widget Settings menu, there you can find settings that allows to control statusbar height and font size.
However, for development snapshot version (2.2.2-alpha), located there -
https://github.com/LibreCAD/LibreCAD/releases/tag/2.2.2_alpha-latest) - you may use more flexible status bar, where all sections that are presented in status bar may be used as intepended toolbars (and so be re-arranged as needed)