Hpl Model Editor.. How?

[Amnesiaplayer]

Thanks!! but that was not exactly what i mean....
thankyou , i learned now how to build on heights... first i didn't know this
but i mean... to make a big map... see the picture?! i want to progress further... but i can't... it's too.. Weird ?! there is a limitation.. but how did the other peoples build big Maps?! (not with floors or something) but so big like...if you played premonition... the streets... i even can't reach the other side on level editor... or TEnebris lake... one BIG map... or just the NORMAL amnesia The dark descent... where it is so big... i can only reach the Castle room... but there is ALOT of things right behind the screens where ican't go to look... (can't see it , only camera view...) it's too big i want to make big maps to... isn't there a option to walk like mapview? that's the most easy thing for the level editor of all