I just made a new account in App Inventor using my Google account, and made a new project named FirstProject , and after going to tutorials I returned and found a screen that says something like ( someone has signed in with your account. do you want to use this device or the other device or use both? ) That sounded scary as if someone hacked my account. Please tell me what to do. Thank you for reading
This also happens if you are logged in in multiple browser windows. App Inventor allows you to choose an active session
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Change your Google Password.