I just noticed that enabling AllowColumnResize holds a small bug.
Making a column bigger works.
Making a column smaller works too but also results in the column being activated for sorting.
And btw: there is no way to reset a sorted grid, please correct me if I'm wrong.
Indeed the PrimeNG table component that Radzen uses seems to trigger sorting when the user releases the mouse over a sortable header.
Also it doesn't support unsorted state - clicking the header toggles between sort states but does not clear it.