I can see from your image, that BIAB has added bars -1 and 0 (the count-in bars) and that bar 1 starts where your right arrow is pointing. Without knowing what audio you started with, BIAB has interpreted that the pick-up note and the first bar of your music belongs in the count-in bars. This is why you have lost the bar lines.

My guess is that you have imported your audio using the default settings. If so, these default settings assume that your audio has a 2-bar count-in. If this is the case, it would seem that your audio does not have a 2-bar count-in.

Try this...
1) Kill the audio that you have loaded.

2) Import your audio using the settings that I have indicated on the image below. This will import your audio to chorus 1, bar 2, beat 1 and tick (partial beat) 0.

3) For your first bar line, estimate where beat 1 occurs in the bar that contains the pick-up note. This will set bar 1 as the bar that contains the pick-up note. In
BIAB it is often better to put a pickup note at the end of the first bar rather than at the end of the last bar of the count-in.

4) Have a read through my instructions on how to locate the timing of bars in the pdf at the below link. This will help explain how BIAB's automatic 2-bar count-in works.

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=821394#Post821394

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MY SONGS...
Audiophile BIAB 2025