Since you are printing the directories on the way out you should be able to just do the following:

use strict;
use warnings;
use File::DirWalk;

my $folder = 'E:\test\foldersize\1-folder|E:\test\foldersize\2-folder|
+E:\te
+st\foldersize\5-folder';
my $depth  = 3;

my @directory = grep!/^\s*$/, split/\|/, $folder;

my @folder;
my %dirs;
for my $directory (@directory){
  my $dw = new File::DirWalk;

  $dw->onDirLeave(
    sub {
          my ($dir) = @_;
          if ( !exists $dirs{$dir} ) {
              if(  $dir =~ /(.*)\\/ ) { undef($dirs{$1}); }
               push (@folder, $dir);
          }
          return File::DirWalk::SUCCESS;
       }
     );
                                            
    $dw->setDepth($depth);
    
    $dw->walk($directory);
}

print $_,$/ for @folder
[download]

and hence it won't print any directory that has any directories in it.

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