I had to change coding. This little example will work: 

use strict;
use warnings;
use Excel::Writer::XLSX;   
 

my $workbook  = Excel::Writer::XLSX->new( "Cell_Borders.xlsx" );
my $worksheet = $workbook->add_worksheet();

my $textbox1 ="Hello World!";


    my $format_box = $workbook->add_format();
        
    $format_box->set_top('5');
    $format_box->set_bottom('5');
    $worksheet->merge_range( 'A8:B8', "$textbox1", $format_box );

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This will add a border on the top and bottom cell.

To fix the problem, I had to add the formatting calls individual (i.e. $format_box->set_top()) and not the to add_format() method.

In reply to Re^2: Adding Borders to Cells using Excel::Writer::XLSX by GuiPerl
in thread Adding Borders to Cells using Excel::Writer::XLSX by GuiPerl

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