Setting the time signature using the signature track/Tempo Track Editor
You can also add, edit, and delete time signatures using the signature track or the Tempo Track Editor.
Please note the following:
The score always shows the time signature events set in the signature track/Tempo Track Editor, regardless of whether or not the Tempo button is activated. Likewise, any time signatures you create in the Score Editor are shown in the signature track/Tempo Track Editor.
You cannot create composite time signatures using the signature track/Tempo Track Editor.