This functionality is only available for certain module packages. Info

2D Flip Commands

The Flip commands allow you to flip over (mirror) 2D objects like splines, polygons, etc., as well as groups and imported drawings.

Note:

Texts can never be flipped.

Flip vertical

This command flips the selected object(s) along the vertical axis.

Flip horizontal

This command flips the selected object(s) along the horizontal axis.