Hello .....  to all

When im try to put some background in layer 4000x2048  , i put size of image same like layer 4000x2048.And here is result
How to reslove this problem .....sooryy for spaming if this is my mistake .......:)

And one more how to remowe white backgrund from sprite shet ..., and when im trying to input tiles for game i cant put 12x12 -144 images because program make picture like.......one picture and there is 2 heroes on two part....can im rise or low like 10x10 .I dont have automaticli just like on video 11x1 .How to set on automaticly. :)

Sorry for english im like to speak .With no grammar .. :P