User interface changes
The column menu that appears in the top right corner of columns in the account and people girds was removed.
Don't worry, you can still sort and hide columns.
To sort a column, just click on the column heading. The first click will sort ascending. If you click again, the column will sort descending. If you click a third time, the sort will be removed. Give it a try!
To hide a column, click on the blue "hamburger" menu that appears in the top right corner of the grid.