Sort a column

Click the column heading bar.

Select a single message

Click the message.

Select multiple contiguous messages

Hold down the Shift key while clicking the messages.

Select multiple noncontiguous messages

Hold down the Ctrl key while clicking the messages.

Select all messages

Select Edit > Select All.

Copy selected messages

Select Edit > Copy, or click the Copy button in the toolbar.

Delete selected messages

Select Edit > Delete, or click the Delete button in the toolbar.

Clear all messages

Select Edit > Reset.