It is possible to view configurations and functions in mission editor. For this, you need to create three user missions:

1. Load a map you want
2. Create a basic project and save it as a user mission.
3. Create separately a supporting project to view configuration classes and functions, and save it as a user mission:

• Create a player unit
• Create Functions module. No synchronizing needed.
• Create a trigger:

• Set both Axis A and B to value of 0
• Enter the code into Condition field:

!isnil "BIS_fnc_init"

• Enter the code into On Activation field:

[] call BIS_fnc_configviewer (for configuration classes) / [] call BIS_fnc_help (for functions)

The set of the projects allows you to quickly switch between a viewing and working over a mission.

NOTE: The viewing functions run when you open the supporting projects. To restart  the viewers you have to restart these projects.