By default, columns split available width into evenly-distributed areas. You may also choose a specified width for certain columns to fix the layout of their contents across different screen and browser window sizes (the other columns without set widths will evenly split the remaining space).
The first column of main page content has a specified width of "Medium" that remains constant even as the page width changes. The remaining columns (2 and 3) automatically adjust by splitting leftover space.
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