Clicking the control in the top right corner of the Issue List and selecting Add / Remove Fields opens the field chooser:
The columns displayed on the Issue List are determined by the fields selected in the field chooser.
To add fields to the display, move them from the Available Fields section to the Displayed as Columns section, to remove them from the issue list move them back.
Fields can be moved by selecting one or more fields and using the arrows or click on the 'handle' and drag and drop.
Move fields up or down in the display column to change the order of display.
Move fields to the Display on Extra Row section to create multiple rows of display on the Issue List.
NOTE: Columns displayed on the issue list are automatically saved with the filter when the filter is saved.