Error with default UI and terrain screen

Initially when i turn the Galaxy Editor on,

the screen is layered with white filter thing.

but when i press 'V' for lock game view settings, it turns out fine.

Help please??

 

sorry this study is not my territory

[영타 → 한타 자동 변환]

Click terrain.

[영타 → 한타 자동 변환]

Sometimes, when you select Doodad layer, like that will happen.

[영타 → 한타 자동 변환]

^clearly i didn't?

[영타 → 한타 자동 변환]

Press T.
And, press U.
After that, press Ctrl+Shift+H.
이거 맞으려나..