Use setColumnWidth(num) method to set the width for all columns
grid.setColumnWidth(50); // set width to 50px (all columns)
Use setColumnWidth(num, col) method to set the width for the single column
grid.setColumnWidth(50, 0); // set column-0 width to 50px
Use setColumnWidth(array) method to set the widths for all columns with array
grid.setColumnWidth([50, 100, 75, 30, 100]); // set column widths using array
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