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Then you can see the problem messages and fix them with 1 click (2).
If there is a newer version of JExcel, another banner will help you in the top:
This banner can be disabled in the admin panel. (Coming soon)
To turn it off, go to the icon (1), and select the option add-on (2).
Then select the tab "Configuration" (1), and select the option to hide it (2).