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Hello and thank you PrestaServicePro,
There is no possibility to configure from the backoffice.

Mediacom87 gave me the solution.
The changes must be made on the file : /src/Core/Domain/Product/ProductSettings.php

Here is an extract of the code, if it can help someone:

    /**
     * Bellow constants define maximum allowed length of product properties
     */
    public const MAX_NAME_LENGTH = 128;
    public const MAX_MPN_LENGTH = 40;
    public const MAX_META_TITLE_LENGTH = 70;
    public const MAX_META_DESCRIPTION_LENGTH = 160;

    public const MAX_DESCRIPTION_SHORT_LENGTH = 800;
    public const MAX_DESCRIPTION_LENGTH = 21844;