You might want to investigate "Lead-in".

In options>preferences>lead-in, you can set lead-in on or off. For BIAB, lead-in is a pickup bar that is used as the equivalent to a turnaround at the end of a song.
It will automatically be printed on the first staff, so even if you have 4 bars per staff, with a lead-in, it will show 5.
The other piece of this puzzle might be count-in, which is typically 2 bars of drum to set the tempo.

Using the two together, you can have the lead-in bar included in the count-in. So the drum sets the tempo and the pickup / lead-in starts in the second bar. There is also a smart count-in that silence the drum during the lead-in notes.

It sounds complicated, but it really isn't. It's kind of 'set it and forget it'

BIAB for Windows Version 2019 (643)
Windows 10 (1909)