Hi Giuseppe,
You can create an app using the App Designer to modify the values of Simulink block parameters.
To know more about building apps using App Designer, you can refer to this documentation page: https://www.mathworks.com/help/matlab/app-designer.html
In the created app, using numeric "Edit Field" components and the "set_param" function, you can interactively modify Simulink block parameters. Have a look at the following MATLAB Answer for more details.