How do I remove Windows 10 Version after Installing and Linking Steam

I have linked my Steam account, however, the PSO2 bin shows empty and there is nothing in my mutable back-up folder. However, the new install definitely took up another 75GB on my hard drive. I went from ~ 175GB before installing steam to 250GB now. Anyone know where these files might be hiding and how to delete them?

@Itesh dude im getting an error how did you link it I just downloaded the steam version and got this show up when i tried to open the steam version

I have never used tweaker at all I'm EU as well do i need to set my region back to UK before opening ?

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My Ms version is working fine still