Hello Donald,
You don’t have the resize: true property in the second to last column configuration. If you don’t have it, Gantt doesn’t add the resizer:
https://docs.dhtmlx.com/gantt/desktop__specifying_columns.html#resizing
You can see the difference in the following snippets:
Without resizers:
https://snippet.dhtmlx.com/u6bcdxl4
With resizers:
https://snippet.dhtmlx.com/t5ba0gzu
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With your help, the problem was solved. Thank you very much