This is not earth-shattering.
But I sure wish I had discovered this months/years ago.
I always knew how to select multiple bars, just take the mouse and select the bars.
But for some reason BIAB refused to allow me to select just one bar!
So today I discovered how.
You select the one bar and pretend you want to select the next bar.
Then you psyche BIAB out completely.
You go back to just the one bar you want and presto it's selected.