MATLAB stores a list of toolboxes in a cache file.If you install a new toolbox, the cache file may not be updated. To resolve the issue, you can update the toolbox cache file by running the following command in MATLAB:
After running this command, restart MATLAB and run the "ver" command. It should list all of your installed toolboxes.
If you're still having issues, you can reset the MATLAB path by running the following command in MATLAB:
Then, restart MATLAB and run "ver" again. It should list all of your toolboxes again.
If the issue persists, the toolbox may have not been successfully installed. In this case, re-installing the toolbox may be a good approach.