SQLyog v13.1.1, 64 bit
When opening a new connection (FILE/NEW CONNECTION), the “Saved Connections field truncates data to the right, and there is no way to see it. The END key, or the arrow keys will not reveal the contents that are truncated. When you drop down the list of connections, the same situation exists for those connections in the list.
Suggest a horizontal scroll bar, and enable the HOME, END, LEFT_ARROW, RIGHT_ARROW keys for the field and the drop down list OR simply sizing the horizontal size to accommodate the longest connection string defined upon entering the field.