ETO Results will sort a table by the leftmost column by default.
The following table is sorted by Participant Site Identifier because it is the first column in the table.
This table is now sorted by Subject Name after moving the column to the left.
You can also change the sort of the table by right-clicking in the column, selecting "Data", and choosing "Add Sort". The formatting panel will show the sorting options, you can choose "Ascending", "Descending", or "Create Custom Order".
You can navigate to sort a table by having the properties panel open, choosing the report element data, and selecting the sort panel. From there, the "Add a sort" drop-down will let you select the column you wish to sort.
Now the table is sorted by Subject Name in Descending order.
Advanced Sorting
The custom sorting option will let you choose a custom sort. Select the table > open the sort panel > Click on the 3-dot icon > "Create Custom Order". You will see the "Custom Order" window.
In the Custom Order window, you'll be able to manually sort your values. In this case, we are going to manually sort by first name alphabetically.
Once the custom sort is made, hit OK.
NOTES
You cannot have more than 2 sorts on a table. You will need to select "Remove all Sorts" to update a new column you want to sort by.