In the cloud version there is a link to restore password in login page.
To restore password in the file/server database you need to ask someone with admin right in this database. And Admin will change password for you.
If you only one admin and forgot you password from your database in your network, there is no way to restore it.

You have to use special software (like Bitwarden/1Password) in case if you can lose/forget you admin password.

Okay Thanks for update.
And I think we should develop 1 small application to restore/change the admin password.
When we forgot their password they should receive 1 Authorization code on their registration email and then we can change password.

Because sometimes it happens with customer they forgot their password.

Please check settings
https://accountingsuite.io/docs/security-settings/#4-toc-title

It is possible to get restore password option to file mode database. But it needs to be set up before losing password.