Unfortunately, the Log Message Filter does not change the logging which is done in the CMD window when the FME is called from a command line.

With large datasets, there will be hundreds or maybe thousands of lines generated by the Reader. This is not helpful and may prevent scrolling up to see previous messages if the logged content exceeds the CMD window's vertical screen buffer.

See also: https://community.safe.com/s/question/0D54Q00009jjn9vSAA/limitshorten-the-logging-in-command-prompt-window-when-executing-fme-with-command-line?t=1661867264885