I'm not sure what Default UI you have in this video. As I stated in my above post to @Pinco, the Defualt UI is looking for the close button which is missing from your video.There u go thx @DJAd
So we mainly got 2 problems in this video:
1 - health bars problem in Default UI.
2- Spells going inactive when target is off-screen, what if i wanted to precast an explosion or any other spell when the target is not on my screen.... The end of the video shows u an option Pinco implemented in his client to solve this issue (Disable spell buttons while casting - turned off) / which we dont have on our Default client.
Thx @Bleak for ur quick response.