Default columns number less then 5 about spreadsheet

[vergilet]

@zdavatz,

Sorry, maybe I have described my case unclearly.
To generate a new XLS I use the following code:

    book = Spreadsheet::Workbook.new
    sheet = book.create_worksheet
 
    header = ['col_1, 'col_2', 'col_3']
    sheet.row(0).concat(header)
 
    spreadsheet = StringIO.new
    book.write(spreadsheet)

    spreadsheet.string

I am expecting to receive the next screen:

But I receives table with two extra columns:

The only solution I came up is to merge column 3 with 4th and 5th:

sheet.merge_cells(0, 2, 0, 4)

But I believe I am missing something.
Any suggestions?
Thanks.

[zdavatz]

Try LibreOffice.

[zdavatz]

Have you read this? https://github.com/zdavatz/spreadsheet/blob/master/GUIDE.md

[vergilet]

Can you please point me at exact place in the GUIDE?

[zdavatz]

Does this help you: https://stackoverflow.com/questions/39986323/ruby-spreadsheet-getting-column-count-in-xls-file/39986936

[zdavatz]

with which software do you open the file?

[vergilet]

I use Numbers App (https://www.apple.com/uk/numbers/)
Now I see that it could be the problem with software.

Thanks for help!
Closing it.