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Thank you Mamba,
Unfortunately, that's what I'd already set up and I've just checked ! This has no effect because users still have a choice of 4 editors ...
That's not the only problem, the moderators don't have their privileges; at the moment only the administrator has moderator functions. However, the moderators are declared in the module parameters !
I should point out that the site runs under PHP 7.3.33, is that the problem?
Regards / G.