[Dx4win] Deleting the Contents of Receive Window in MMTTY

[WILLIAM COOPER]

Would someone please tell me the steps in MMTTY to 'Clear' the Receive Window in this program by using only one keystroke?
 
Until recently I was able to 'Wipe Clean' this window (the Receive Window) by only hitting the F8 key.  I guess I must have changed something, because, "It don't work no more", and obviously I can't find my instruction sheet!!
 
I will surely thank someone who can help me; I really don't like going to the 'VIEW" and etc., etc., when the one key did it all.
 
Thanks,
 
Bill Cooper
W5ZAF