You can filter list of reports by clicking on the right corner of the column header:
The popup list with all available values will be displayed. In the example above report's list contains reports with "New" and "Fixed" status. Suppose that we want to view only fixed reports. To to so just click on the "Fixed" item:
As you can see, the report's list now displays only fixed reports. The "Fixed" check box is now marked and at the bottom of the list there is a filtering condition.
To show all entries - just open this filtering popup list again and select first "(All)" item.
You can filter report's list by any visible column. If you don't see desired column - just add it.
Note that you can also define more complex filtering conditions.