Room Background Picture rescales down automatically

Hello friends

I have a room of 11,500 pixels x 6480 pixels. and I am using an image of the same size in the background of this room.

But when compiling the game, GameMaker gives the following message:

Warning : resource spr_ow_spaceBG2_5cd5c7b5-a7ae-4816-b869-49a58fa9aed5 rescaled from 11520,6480 to 1440,810

And of course, the background appears blurred in the game.

I didn't have this kind of problem before. why do you think GameMaker automatically minimizes this image?

Thank...

Room Background Picture rescales down automatically