$FIXED@Leg Rail-1.1<1> - what is this?

It determines whether a component is fixed or floating.

I am not sure what you searched for in the help, but searching for $fixed like this:

http://help.solidworks.com/SearchEx.aspx?query=$fixed&version=2018&lang=English&prod=SolidWorks

Gives this help topic as the second search result:

2018 SOLIDWORKS Help - Fixed or Floating Position in Configurations

This help topic, which is the 9th topic in the search results gives a summary of all of the different design table parameters:

2018 SOLIDWORKS Help - Summary of Design Table Parameters

I hope this helps,

Jim

Hi Hal

The equivalent of this,,,

or to be more accurate (N)ot $FIXED would be float

see 2017 SOLIDWORKS Help - Summary of Design Table Parameters