Hey @CowichanNadine, I see this is your first post. Welcome!
If you sign out of the app or device, your information is no longer available. Square devices can be used with multiple accounts, and no data is stored on the hardware itself. Depending on the device you have, you can also do a factory reset.
Feel free to share more details so I can better assist you.
MayaP
Square Community Moderator
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