@Tartilla, the high possibility of this is the invisibility of a certain layer where your object was. And by the looks of it, there is only one layer in your layout and when that layer became invisible, the blank white layout paper disappeared as well.
Click on the Layer Tab in Projects Bar ---> then Set Layer0 or any layer there to visible.
The Things you can create is only limited by your imagination. If you don't have the skills then use your motivation as a natural force to exceed all expectations. Chadori RebornXD