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I love multiple accounts in Android. When at airport I can switch to non personal account and show anything they want

What do they ask you to show them at airports?

Text messages, maybe photos

> Text messages

Is that from apps like WhatsApp and Telegram? And SMS? What about email?

What happens if you'd say that you can't, because it's your employer's laptop and data, and it's confidential?

Personal accounts can be configured to simply not have access to those apps.

"Oh, I don't use Whatsapp."

Customs will confiscate your laptop, then.

Which countries do this? I am pretty sure TSA can only ask you to demonstrate the device functions as intended, usually by powering it on.

They’re referring to customs rather than TSA. Only applicable entering/leaving a country.

US customs will do this, not TSA. It is only when entering the country.