Togging Player Visibility In GUI

Hello all! I am trying to make a inventory in which you can toggle player invisibility and other things.

This is the code in the event that includes the array list

Code (Text):

public class Events implements Listener {
   
    public Events(Hub hub) {
        // TODO Auto-generated constructor stub
    }

    @EventHandler
    public void onPlayerVis(PlayerInteractEvent e) {
        Player player = e.getPlayer();
        if (Options.toggle.contains(player.getUniqueId())) {
            for (Player targetPlayers : Bukkit.getOnlinePlayers()) {
                if (player.canSee(targetPlayers)) {
                    player.hidePlayer(targetPlayers);
                    player.sendMessage(Hub.prefix + "Players have been hidden!");
                } else if(!Options.toggle.contains(player.getUniqueId())){
                    player.showPlayer(targetPlayers);
                    player.sendMessage(Hub.prefix + "Players are now shown!");
                }
            }
        }
    }

}
 

This is the code that is in the GUI

Code (Text):

        switch(event.getCurrentItem().getType()) {
       
        case EYE_OF_ENDER:
            if (toggle.contains(player.getUniqueId())) {
                toggle.remove(player.getUniqueId());
            } else if (!toggle.contains(player.getUniqueId())) {
                toggle.add(player.getUniqueId());
               
            }
            break;
        }
       
       
    }

 

Sorry about that, when I try and toggle it doesn't make everyone vanish.