You need to setup the
Read 1D Barcode Steps to capture the expected number of barcodes in your image.

2. Specify the number to log on the right side of
Measurements Logged tab in
Data Logging Step.

3. Then you can see the update of barcodes logged in the
Data Formatting tab.
Additional Information
If you are not sure on the types of barcode and the the numnbers of barcode to detect in your ROI, you can tick the Auto Setup checkbox and VBAI will automatically detect recognizable barcode.