Info 2 [Q] wallpapers doesn't fit to screen ?!!

hi guys
how can i set my wallpaper to appear (all of it ) in the screen???
when i download any wallpaper and try to set it as home or lock screen it shows blue cropping lines that cut only part of the wallpaper to the screen
this is annoying cause i have many wallpaper but doesn't fit to the screen
or is there anyway i can adjust the wallpaper to scroll with the home screen so i can enjoy the whole wallpaper ??

thnx in advance
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