Mantine React Table

Mantine React Table lets you easily change the default widths (sizes) of columns.

Mantine React Table has 3 layout modes that affect how columns styles are applied internally. Depending on which features you enable, the layoutMode table option will automatically change to the appropriate value, though you can override it with your own value if you want.

1. "semantic" (default with default features) - uses default css styles that come with <table>, <tr>, <td>, etc. elements.

2. "grid" (default when virtualization is enabled) - uses CSS Grid and Flexbox styles instead of default styles.

3. "grid-no-grow" (default when column resizing is enabled) - uses CSS Grid and Flexbox styles, but also sets flex-grow: 0 on all columns and adds an empty "spacer" column to the end of the table to fill the potential remaining space.

If you want your columns to have an absolute width, you can use the "grid-no-grow" layout mode and set the size option on each column.

You can change the width of any column by setting its size option on the column definition. There are minSize and maxSize column options available to enforce limits during resizing events.

The size, minSize, and maxSize do not take in any CSS width unit. They are only numbers that represent the width of the column in pixels.

const columns = [
  {
    accessorKey: 'id',
    header: 'ID',
    grow: false, //don't allow this column to grow to fill in remaining space - new in v2.8
    size: 50, //small column
  },
  {
    accessorKey: 'username',
    header: 'Username',
    minSize: 100, //min size enforced during resizing
    maxSize: 400, //max size enforced during resizing
    size: 180, //medium column
  },
  {
    accessorKey: 'email',
    header: 'Email',
    grow: true, //allow this column to grow to fill in remaining space - new in v2.8
    size: 300, //large column
  },
];

You can also set grow properties on the column definitions when using layoutMode "grid-no-grow" or "grid".

If the layout mode of your table is "grid" and you set grow: false on a column, that column will have a fixed size and will not grow to fill in the remaining space of the table.

If the layout mode of your table is "grid-no-grow" and you set grow: true on a column, that column will grow to fill in the remaining space of the table.

If the layout mode of your table is "grid-no-grow" and you set grow: 1 on one column, and grow: 2 on another column, the first column will grow to fill in 1/3 of the remaining space of the table, and the second column will grow to fill in 2/3 of the remaining space of the table.

If the layout mode of your table is "semantic", the grow column option will have no effect, but columns will size themselves to fit their own content better than the other layout modes.

Mantine React Table is not designed to use percentage column widths well by default. This is because having horizontal scrollbars on tables is both a very common use case, and usually the best way to ensure that the actual content of the cells in each column is visible and not cutoff or wrapped excessively.

If you disagree with that, that's fair, and you're not out of luck. Mantine React Table exposes all mantine props, so if you really want to, you can add whatever CSS you want to achieve your own custom column widths behavior. This is not recommended by the maintainer, but some developers have found it useful to set all column sizes and minSizes to a very small number like 1, 1.5, 2, ect., and then use either layoutMode: "semantic" or layoutMode: "grid". This makes the columns act more like they are using percentage widths, up until a certain point. If you really need to never have a horizontal scrollbar, you can edit the mantineTableContainerProps.style styles to set overflowX: "hidden". Be very careful with this though, as this could cause your table to be unusable on smaller screens.

If the above still does not get you to where you need to be, mantineTableHeadCellProps.style, mantineTableBodyCellProps.style, and mantineTableFooterCellProps.style and more are all exposed and available to you to override with whatever custom CSS that you need. Just be aware that non of the built-in TanStack Table size APIs will be accurate anymore.

Making your scrollbars look better (especially on Windows and Linux) can go a long way to not letting a horizontal scrollbar ruin the look of your table.

Here's what this docs site uses in its global CSS to make scrollbars to more like the default Mac OS scrollbars for everyone:

::-webkit-scrollbar-track {
  background-color: transparent;
}

::-webkit-scrollbar {
  right: 0;
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-thumb {
  background-color: #999;
  border-radius: 8px;
  width: 12px;
  height: 12px;
}

By default, columns will have the following size properties defined:

defaultColumn = { minSize: 40, maxSize: 1000, size: 180 }; //units are in px

You can modify the default column widths by setting the defaultColumn table option on the table.

const table = useMantineReactTable({
  columns,
  data,
  defaultColumn: {
    minSize: 20, //allow columns to get smaller than default
    maxSize: 9001, //allow columns to get larger than default
    size: 260, //make columns wider by default
  },
});

As discussed further in the Display Columns Guide, you can customize the options of the built-in columns that get generated under the hood by MRT by enabling certain features.

const table = useMantineReactTable({
  columns,
  data,
  displayColumnDefOptions: {
    'mrt-row-select': {
      size: 50, //adjust the size of the row select column
      grow: false, //new in v2.8 (default is false for this column)
    },
    'mrt-row-numbers': {
      size: 40,
      grow: true, //new in v2.8 (allow this column to grow to fill in remaining space)
    },
  },
  enableRowNumbers: true,
});

return <MantineReactTable table={table} />;

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