Hello Vanon & Bertram,
AxCrypt is about encryption, not access control. This is an important distinction, I wrote a blog post about this some time ago, in slightly different context, but it still has some valid points about this. See https://www.axcrypt.net/blog/encryption-vs-authentication/ .
The point is that it’s all about the password. To protect the device, you should use screen locks and similar mechanisms. Adding a “screen lock” to AxCrypt would just confuse the issue I think. Use a strong password, and available device locking!