Dynamic Data Grid - How to adjust the column widths

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I am struggling to locate the following code - grid-template-columns: 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr 1fr; within dynamic datagrid. I would like it to work like the following  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr))   Any ideas how to change this? Also unable to block the containers from overlapping (See Below)  
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