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Searching
In search text box (1) type in phrase you would like to find. Rows which do not contain the phrase will be hidden.
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You can put your issues in alphabetic order by clicking on the column you would like to sort your issues by and then clicking one of the buttons with Sort label (2).
Sorting may cause your subtasks to be put far from parent tasks. In order to prevent that just check Preserve grouping while sorting checkbox and your subtasks will stick to their parents after sorting.
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If you want to hide some of the columns, you can use the Manage visible columns button (3). You can also move selected column to the left or the right by clicking suitable button with Re-order column label (4).