Hidden files

What PC files are you talking about and how did you transfer them?

Did you use some sort of backup app to copy files and folders or what? If you use the Apple Migration assistant, I'd be very surprised if anything other than usable data was transferred and even then it would need to be compatible with macOS.

Migration Assistant: Transfer from PC to Mac with Migration Assistant - Apple Support

To unhide those files use the key combo Shift-Command-period (⇧⌘.) in your Finder window.

Use the combo again to hide them.

Delete the Period (.) at the beginning of the file or folder name.

Hmmm.

Have a look at this from Macworld magazine: 8 ways to hide files and folders in OS X - Macworld

It's older, but there might be a hint or two.