When you drag n drop a midi file in, in the import dialog set 1 bar in the offset.
You can also select all notes in piano roll by right click then cut then paste where you want it to start.

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BB23-Import-Midi-Bar-Offset.png (20.16 KB, 21 downloads)
BB23-Select-All Notes-Cut-Paste.png (73.08 KB, 21 downloads)