How to set table column size in TableRow for Flutter Table

Method 1

You can use defaultColumnWidth inside Table if you want to set same width to each column,

Table(
    defaultColumnWidth: FixedColumnWidth(200.0),
...

Output

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Method 2

you can use a different width for each column.

Table(
columnWidths: {
                0: FlexColumnWidth(1),
                1: FlexColumnWidth(4),
                2: FlexColumnWidth(4),
              },     
...

Output

For your specific case you can use

Table(
  defaultColumnWidth: IntrinsicColumnWidth(),
  ...
);

, since you want the column width to adjust to the text lengths. IntrinsicColumnWidth sizes the column based on the width of the content in each cell, ie, the column width increases or shrinks depending upon the length of the content in the cell.