It would be very useful to browse databases even when no spectrum is loaded. The problem is that in this case we don't know which nucleus to use.
I suggest that when no spectrum is loaded, we show a select that lets the user choose one of the nuclei present in the selected database. Most of the time there will be only one, so we can switch to it directly.

It would be very useful to browse databases even when no spectrum is loaded. The problem is that in this case we don't know which nucleus to use.
I suggest that when no spectrum is loaded, we show a select that lets the user choose one of the nuclei present in the selected database. Most of the time there will be only one, so we can switch to it directly.