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If you're using Thunderbird 11, you are using a mail client full of security issues.

https://www.mozilla.org/en-US/security/known-vulnerabilities...

In addition to the point others made about vulnerabilities, you should know that Thunderbird currently split the calendaring features into an add-on called Lightning that is included but disabled by default. If you don't want a calendar, you won't get a calendar.

Careful. Old versions of internet-facing applications like email clients are dangerous and put you at risk. They often have widely known security issues which can allow malware to access your PC.

I'd advise upgrading Thunderbird and ignoring the features you don't use, or switching to an actively-maintained mail client which is designed to be simpler than Thunderbird.

In that case may I recommend mutt or claws mail? Basic, unlikely to change significantly, and still getting security patches.

Seeing comments here of people who want mobile-like or web-like features in Thunderbird, I feel old school, but daaamn, 11? That's 6+ years of piled remote vulnerabilities. Clearly Thunderbird is not to your liking and you should try other clients.