Question Can't change Windows 10 theme ?

Feb 21, 2021
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[I AM NOT GOOD AT ENGLISH]
I can't apply my saved themes. But when I apply the same wallpaper as my 'saved theme' only then I can apply my saved theme..
I mean I saved a theme which includes a wallpaper and a system colour, and same goes for my other themes, and then when I try to change my theme Only taskbar colour is changing but not the wallpaper and other stuffs.....But when I change only the wallpaper as per theme only then i can change a theme..