The 'All But Selected' option does not select all the entities that are
expected.
Solution
The 'All but Selected' option only works for objects that are within the view
or work area.
If any objects are outside the work area, they will not be selected.
Zoom out or perform a 'Fit' operation before selecting the 'All But Selected' option.
Notes and References
Hardware/Software Configuration
Platform: all
OS: n/a
OS Version: n/a
Product: NX
Application: SYSENG
Version: V7.5
Function: SELECTION
Ref: 001-7312471