Since Flutter 3.27, you can pass a spacing argument to your Row and Column widgets (rather than using SizedBox).

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Flutter 3.27 introduces a new `spacing` argument for `Row` and `Column` widgets, eliminating the need for `SizedBox` to add fixed spacing between child elements. This feature allows for easier mixing of fixed and proportional spacing in layouts.

New Spacing Argument in Row/Column (Flutter 3.27)