passing parameter values beween a GUI and other scripts

I'm trying to built a GUI (desigend in appdesigner matlab 2020a) to collectuser input data from a scritp to execute calculations, however it is unclear how to get the user input into the workspace. I did declare the variables to have Access = public:

properties (Access = public)

Roi_cam1;

Roi_cam2;

Roi_cam3;

XY_cam1;

XY_cam2;

XY_cam3;

Cal_cam1; % Description

Cal_cam2;

Cal_cam3;

videoName_cam1;

videoName_cam2;

videoName_cam3;

shape;

disch;

Circ;

Exp_name;

Directory;

end

The matlab documentation is not exactly very clear on the topic of getting data in and out of a GUI. Any help is welcome

kind regards

Francois Clemens