Hello Sreneex3,
If you are facing difficulties with the iCloud for Windows application, you can use the steps below to sign out of your Apple ID. Afterwards, you can sign back into your desired account:
1. On your Windows computer, open iCloud for Windows.
2. Click “Sign out,” then follow the onscreen instructions.
If you decide you want to access information stored in iCloud on your PC, you can sign in again.
You can also find those steps in this resource: Sign out of or uninstall iCloud for Windows - Apple Support
If this is occurring with the iCloud website, you'll want to reach out to either Microsoft or the developer of your web browser: Contact Us - Microsoft Support They'd be in the best position to help with their browser auto-filling unexpected Apple ID credentials.
Take care.