Hello! Sorry for saying that but i had an issue with the os today. My desktop after a restart has been deleted every widget and changed any personal configuration and gone back to stock look.
I dont know exactly why but thats what happened. 
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Some good first steps:
i had similar issues as well today. for me, it appears to have just affected the appearance settings, and not things like workspace behavior i just had to choose the the correct global theme, plasma style, icons, etc. and all was well again. definitely weird and momentarily worrisome.
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Yipes. Is this the 5.25.x version? Glad I am still on the 5.24.7!!!
It may be caused if kde ends the session at shutdown. Check it in system settings (start and shutdown).
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