Power saving mode won't turn off even if its already turn off (limited features)

[Bellaswan17]

Hi. Can someone pls help me. I don't know if I acidentally turn on the power saving mode. Its just so happened that the dark mode was turn on and my lockscreen themes was gone. I checked the power saving mode it's already turn off. Because of it I can't change my wallpaper, I can't also change my themes and etc. Can someone pls help me. 

[Jnoitab]

One UI Home.

[Bellaswan17]

I did not know this features existed on my phone