Training Mode is only available on SQL LocalDB or SQL Express databases. So it needs to show SQ in the title bar.
If this is the case and the “Enable Training Mode” button is greyed out, it is likely you are using SQL LocalDB and you have a blank connection string (this is the default setting also!)
I found this issue before, you can read more below, but basically you just need to update your connection string so it is not blank. So if you DO have a blank connection string, Edit Connection and change the “Data source” to
(LocalDb)\MSSQLLocalDB. Save and click Apply. After you login again, you should find training mode is available. If not, try restarting SambaPOS.