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Setup > Settings > Project item > Enable Concurrent Design checkbox. You need to uncheck it.
Keep in mind that others in your group may need to get into the design at the same time as you, and will not be able to. The "Click here to edit" is the price you have to pay to be able to work on the design concurrently.
Also take note of the Server Name - you will need it later if you reset this feature to turn on the concurrent design mode.
It works !
Thank you very much M. Cashman.
In fact, I work alone on a old project then I don't need to enable the "Concurrent Design mode".