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You can change the name of your dropbox folder of the integration of your form by clicking Integrations > Dropbox > Edit Integration
Click the Authenticate button
A pop-up window will appear, just allow the authentication to proceed and then going back to the parent modal window, you will see options to modify the folder names.
Once done, simply complete the integration.
If you have questions, or if I misunderstood your concern, please do let us know.