I had been having issues with the Circle. When I would go into the jungle it wouldn't work on the trees. So after much research and thanks to Stratics I have found the answer. In your Ultima folder you will find a file called UO.cfg. Open the file with notepad and scroll down until you see Circle of Transparency 200. You can set the radius from 200 to 750. Tho it states at 750 at times it may crash your client. I have mine set at 600 without any problems. There are also several other things on the UO.cfg file you can change.
https://uo.stratics.com/content/misc/cfg.shtml
if you would like more information
It seems when you log off the UO.cfg will return to normal. If I can find out anything about a permenant change I will update here
Miki
What did you say? It made me change my mind a lot.