Minor changes Added proportional column behavior to the DetailsList component and enabled custom components in cell headers. (PR #16874 by joshualamusga1) Patches Fix Hidden Panel bug where onDismiss is being fired while panel is closed (PR #17961 by tomi-msft) Combo-box: Disable combobox is focusable using tab (PR #17954 by tringakrasniqi) Fix Slider to trigger onChanged for Home and End keys (PR #17966 by tomi-msft)