Maybe you should use BorderLayout so you can place the f1 container in the 
center of it.
https://www.codenameone.com/javadoc/com/codename1/ui/layouts/BorderLayout.html

Container f1 =  new Container(BoxLayout.y()); 
Container blContainer =  new Container(new BorderLayout()); 

   Button concert=new Button("Concerts");

   Button play=new Button("Theatres");
   Button movie=new Button("Movies");
   Button cinema=new Button("Cinemas");
    Button musicien=new Button("Musiciens");
     Button tactor=new Button("Theatre Actor");
      Button factor=new Button("Movie Actor");
         Button logout=new Button("Logout");
   f1.addAll(concert,play,movie,cinema,musicien,tactor,factor,logout);

blContainer.add(BorderLayout.CENTER,f1);
        add(blContainer);

I do not test it but I have some similar code in my app. It should work.

Regards
Il giorno giovedì 20 maggio 2021 alle 02:36:21 UTC azizaz...@gmail.com ha 
scritto:

> Having this problem. You'll find the display below,  please how to center 
> it? 
>
> CODE:    
>
>
> Container f1 =  new Container(BoxLayout.y()); 
>
>    Button concert=new Button("Concerts");
>
>    Button play=new Button("Theatres");
>    Button movie=new Button("Movies");
>    Button cinema=new Button("Cinemas");
>     Button musicien=new Button("Musiciens");
>      Button tactor=new Button("Theatre Actor");
>       Button factor=new Button("Movie Actor");
>          Button logout=new Button("Logout");
>    f1.addAll(concert,play,movie,cinema,musicien,tactor,factor,logout);
>         add(f1);
>
>
> OUTPUT
> [image: test.png]
>

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