By using the hotkey A ?
Contents of the list
The listview contains a line for each pending or queued transfer. The
line consists of the filename retrieved (without hostname and path), and
the current status.
Current status can be one of the following:
Queued Image will be loaded when network slots become available
Started Transfer process has started
Looking up Looking up host name
Connecting Making connection
Waiting Request sent; waiting for response
99999/99999 Reading
Processing Processing image (remapping it to the screen colors)
Cancel transfers
You can cancel one specific transfer by first selecting the entry in the
listview, then click the 
button.
You can cancel all transfers by clicking the 
button.