And… you can replace a format file by dragging the replacement into the Book details panel, or via the Add books->Add files to selected book records action, or via the Add books->Add files to selected book records from clipboard action.
I use the latter, avoids dialogue boxes and using the mouse. Ctrl+C to copy, Alt-Tab into calibre, Alt+Shift+V (for me) to paste into the book list line.
BR
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