Check documentation for the latest version 6.0 of dhtmlxSuite setColWidth DHTMLX Docs

setColWidth

sets the width for the specified column in pixels (doesn't work with the percentage based grid)

void setColWidth(number ind,string value);

Parameters

indnumberthe index of a column
valuestringa new width value

Example

//set width of the first column
mygrid.setColWidth(0,"150");

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