Screenshot explains it...window of level editor goes past the bottom of the screen, obscuring some tools...
I don't know if you can make it fullscreen or not (I want an answer XD), but all you have to do is move the tab at the top that says "mine.map - HPL Level Editor" farther up...
Go to Edit -> Options, in the General tab in resolution change the Y value to something smaller then restart the program.
SOLVED: EDIT RESOLUTION IN PREFERENCES