Boot Splash Screen on kde not Apply

Hi, I have a one problem in Manjaro kde
When I want to apply a new boot splash screen, after restarting pc, the boot screen does not change and only a circle appears on the screen
Even though I installed Plymouth and Plymouth-KCM, there was still no change
How can this problem be solved?

open a terminal - list the themes - apply the selected theme

plymouth-set-default-theme --list

example applying spinner (root or superuser context needed)

plymouth-set-default-theme -R spinner
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