unable to see other rules for same control, and unable to delete the rule , can u help me as soon as possible
The height of the window is too small, so the rules can no longer be displayed.
Yes window size is too small. For workflow and forms design you should have a relatively large monitor to work with.
You can experiment a bit with zoom but it will give you other strange behaviour in the end.
Only thing that I see is working with a monitor with at least 17" and a good resolution above 1024x768.