As mentioned before initial parameters can be changed by altering values at edit optimization –>Setup.
If you are using random starting values: Select Algorith "Particle Swarm" from drop down option. If you like to choose cutom values choose "User defined"
If you choose User defined, then only you will be able to upate "frist generation script".
First generation script is used to define initial parameters rather choosing random numbers. Those initial parametrs are assigned over setup-parameters window (see the screenshots above). If you click “test” on the script winow(bottom right corner of next generation script) you will be able to see all the asigned paramters. If you chage Min and Max value it will reflect in the 1st generation script values.
eg: If I am optimizing length and I want to use length between 0.2 – 0.4microns rather using random starting values
To make sure the values are changed in 1st gen script, I am running test
As ou can see the initial parameters changed
You can find more information here :Optimization utility – Ansys Optics
Hope this helps