attention, security gap
After setting the master password, you can view emails, just cancel the password entry window! You can't send emails, but you can read them.
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This is only for passwords, you can skip the monit and use Thunderbird without entering anything.
There should be a description in Settings similar to this: A Primary Password protects all your passwords.
Please read this article explaining what does it do: Protect your Thunderbird passwords with a Primary Password.
so how to secure entry into the program?
You could set up a private account within Windows and place Thunderbird there. Otherwise, Thunderbird does not protect starting the program itself