Hi Mustafa,
I understand that you have encountered an issue with the loss of your progress when switching between different MATLAB platforms(Online version, Desktop Version). Unfortunately, as per my knowledge the course progress will not be carried forward in such circumstances.
In order to view your overall progress, kindly refer to the following link: Why did all my online course progress disappear? - MATLAB Answers - MATLAB Central (mathworks.com)
Moreover, I would like to draw your attention to an additional point. Please be informed that course progress is not carried over to a new release. If you wish to maintain your progress, please refer to the following link: Course progress for Simulink and Stateflow Onramp on Simulink Online disappeared - MATLAB Answers - MATLAB Central (mathworks.com)
I hope this information will assist you in resolving the issue. If you have any further queries, please feel free to reach out to me.
