Solve App selecting Independent Plot Var

[Dirk.nl]

Nobody answered me, so my question will not be clear.
I made a copy of the Solve App and renamed it to OpAmp.
This new App has 4 formulas and 11 variables. The order of the variables in the standard Numeric View depends on the order of the variables in the selected formula. This can be confusing, the order of the variables in the standard Numeric View is no longer logical. That is why I made in the Solve App a program with the Input command (fixed variable positions) in a while loop (runs while input returns “1”) including selection boxes for Solve commands, etc. This works very well.
In the Solve App program, I want to overwrite the numeric view with a call to this program. The problem now is that I can no longer select the independent variable, this only possible in the standard Numeric View. There should then be a command to programmatically set it.

Tim or Cyrille, is there a possibility to programmatically select the independent variable? If not, the standard Numeric View can not be replaced!