You can sort the data in columns by either clicking on the column title or opening the column menu and choosing one of the sort options. There are two different sort styles available.
...
Basic
By clicking on the column title, it will automatically sort in ascending order. Clicking it again will sort it in descending order, and clicking it a third time will remove the sort.
...
Multi
If you click on the arrow next to
...
the column name that you want to sort 
it will open a menu where you can choose the sort direction. If you sort a column this way, it allows you to also sort on multiple columns at once. You will notice that as you sort more columns, they will have an arrow next to them (indicating the sort direction) and a number (indicating the rank of the sort, where 1 is the first column sorted).
...
Clearing Sorts
You can remove sorts for an individual column by clicking the arrow
...
and choosing Remove Sort.
...
To remove all sorts, click the menu icon
...
and choose Clear All Sorts.
...