When enough variables are added to a structure to cause the list to be too long for the window, a scroll bar should appear and you should be able to scroll through them. This does not occur.
Regression?: Yes
This occurs in 4.14.0-3195953+++UE4+Release-4.14
This did not occur in 4.13.2-3172292+++UE4+Release-4.13
Answerhub link as it was unable to fit in the appropriate field: https://answers.unrealengine.com/questions/524215/%D0%B2-%D0%BE%D0%BA%D0%BD%D0%B5-struct-%D0%BD%D0%B5-%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0%D0%B5%D1%82-%D0%BF%D1%80%D0%BE%D0%BA%D1%80%D1%83%D1%82%D0%BA%D0%B0-%D0%B4%D0%B0%D0%B6%D0%B5-%D0%BA%D0%BE%D0%BB%D0%B5%D1%81%D0%B8%D0%BA%D0%BE%D0%BC.html
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-38675 in the post.