how to turn OFF quick start after setup is complete

Hello fal2031,

Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you have questions about Quick Start. There isn't a need to end it as it should end on its own. Check ou tthis article for more infomraiton about Quick Start: Use Quick Start to transfer data to a new iPhone or iPad - Apple Support

"Set up your new iOS device automatically using an iPhone or iPad.

Quick Start occupies both devices, so make sure that you choose a time when you won't need to use your current device for several minutes.

1. Make sure that your current device is connected to Wi-Fi and Bluetooth is on. Turn on your new device and place it near your current device. Follow the onscreen instructions to get started. If the prompt to set up your new device disappears from your current device, restart both devices.
2. Connect your device to Wi-Fi or your device's cellular network.
3. You might be asked to activate your cellular service.
4. Set up Face ID or Touch ID.
5. Choose how you want to transfer your data.

• If you download from iCloud, your apps and data download in the background so that you can start using your new device right away.
• If you transfer directly from your previous device, you'll need to wait for the transfer to complete on both devices before you can use them.

1. Keep your devices near each other and plugged in to power until the data migration process is complete. Transfer times can vary based on factors such as network conditions and the amount of data being transferred.

Still need help? Contact Apple Support.

If your new device is enrolled in Apple School Manager or Apple Business Manager, you can't use Quick Start to transfer data from your current device."

We hope this helps.

Cheers!