Trackmap 0.96 DX and SX

Searched trackmap posts but couldn't find what the PDF manual means by Ctrl-DX and Ctrl- SX to zoom objects. Are these keypress equivalents in the keyboard?

Likewise, the installation comes with an alternative trackmapconf-1.txt. I renamed it to try the config in-game, and it doesn't show the map. How do I include the map to display using this config file?
Thanks.
 
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