Based on the description provided, I assume the Python script is being executed in the Anaconda Powershell using a command like:
python3 script
Consider using the system command in MATLAB to gain more fine-grained control over the environment and the process being launched. The command would look like this:
[status, cmdout] = system("python3 path/to/script");
To learn more about system, refer to the following documentation:
Hope this helps launch the python GUI !
