Users who resize columns have no way to go back to the default layout
without manually clearing localStorage in the browser devtools.
So I suggest adding an optional "Reset column sizes" button to the shared GridToolbar
component. When clicked, it calls resetColumnSizes() from useGridState
and restores all columns to their default widths.
I would prefer to know the state of #1278 before working on this, so it would be great to review it.

Users who resize columns have no way to go back to the default layout
without manually clearing localStorage in the browser devtools.
So I suggest adding an optional "Reset column sizes" button to the shared
GridToolbarcomponent. When clicked, it calls
resetColumnSizes()fromuseGridStateand restores all columns to their default widths.
I would prefer to know the state of #1278 before working on this, so it would be great to review it.