Menu is not preserved while copying video file

[Shuttle]

This is my first post, so some minor problems/omissions might be inevitable.

Avidemix 2.7.5 on Windows.
I loaded an mkv file.
The video is set to copy - no changes. The output format is Mkv Muxer.
I am making some changes to the audio tracks.
The output file is exactly as I expected with one exception: the menu from the original source is not preserved, the output video has no menu. This also can be see if I load the file in MediaInfo.

Am I missing something?
Thanks in advance.
 

[eumagga0x2a]

Avidemux supports video and audio tracks only, nothing else, no Matroska menus, no subtitles etc.

Avidemix 2.7.5 on Windows.

Ancient obsolete unsupported version.