When defining a paragraph style, the Line spacing field takes no value other than Single. Lines field only 1.
Any value can be entered during normal paragraph formatting (out of style).
MyInfo 8.3.1
[fixed] Line spacing bug
I confirm that there is such an issue in the current version of MyInfo, which will be fixed in the next update.
Fixed in MyInfo 8.3.2.
Thank you. It is working properly.