Question:
Why is it not possible to change the solving method for the equation system of my model?
Answer:
Basically, there are six methods available for solving the nonlinear algebraic system of equations. However, if your model does not include any nonlinearities (that is, you have created a purely linear system), access to these selection fields is blocked.
As soon as you define a nonlinearity in the model, the selection field for the solving methods is activated, and you can select the desired solving method.