You can sign out of the Kindle app on a mobile device by accessing the settings to "Deregister this Kindle." ...
You can easily restart your Kindle device if it freezes or stops responding to get it back to working.
Many people are unaware, but in 2018 Amazon launched a program called Frustration-Free Setup. It was initially launched for various Echo and Alexa devices and in 2019 came to the Kindle e-readers.
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