The font size of the address bar (directory path) actually differs from "standard" (see screenshot attached), as far as the average font size in the UI (folder tree, main view, tab title) is consistent, while also the Edit Path feature of OneCommander uses the standard font size when highlighting the current path.
I'd suggest to keep the font size of the directory path (address bar) consistent or to implement an option that allows the user to set their own font size.