You can hide the duplicate button using a formula field and then hide the formula field. Here's the code for trash, duplicate and add...

html("
<style>
.hud-menu-button.menu-icon.menu-icon-trash{display: none;}
.hud-menu-button.menu-icon.menu-icon-duplicate{display: none;}
.hud-menu-button.menu-icon.menu-icon-add{display: none;}
</style>
")

You are the greatest. 

That doesn't work with multiple table and come back normaly with the duplicate button.

Yes, the hidden formula field should be on every form you use where the buttons must be hidden. You could also use a global function to prevent repeatedly typing the script and call that function on your forms in a hidden formula field.

Steven

Steven I try all that + a trigger after open in options menu and after a time the duplicata button came back. 

a function like that

function rduplicatbutton(db: text)do
let db :=html("
<style>
.hud-menu-button.menu-icon.menu-icon-duplicate{display: none;}
</style>
")
end

when I hide the formula field with display field only if (null) the button come back at the next refresh but if I leave the field without changing the statut "display field only if =null it work...

I find a way that work perfectly but I could use display field only if =null I have to use a differnet field for condition

Sorry my mistake, don't hide it, In stead You can style the formula field in a way it becomes invisible... (Background & text rgb 238 and hidden label)

Here's an example of an invisible formula field to hide the close form X (black background) :

https://ninoxdb.de/en/forum/use-cases-5abd0b9c4da2d77b6ebfa395/simple-log-in-system-with-datetime-registration.-5e11d00509d132371a594f5c

Steven

and for the printer it is

.hud-menu-button.menu-icon.menu-icon-print{display: none;}

and for the printer it is

.hud-menu-button.menu-icon.menu-icon-print{display: none;}

Thank you steven everthing work great