How do I turn off lock screen collages for slideshow?

[Ryan Nitz]

I have slideshow enables for my lock screen. Not all of the pictures are 16x9. I do not have the setting "show only pictures that fit my screen enabled." It keeps showing a collage of multiple pictures from the folder I set as the source for the slideshow. It is one large picture that takes up the left half of the screen and two smaller ones that fill the other half. It does not do this for my desktop background, which I have set as slideshow using the same folder. Why does this happen and how can I make it stop?

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