This button controls whether the last digit of the frame number (which is all that fit, obviously) is displayed as an overlay on top of each frame, as explained above. The entire frame number is obtained by placing the cursor over the frame and observing the number displayed in the upper right. That's frame "137" in the lower picture, which is why it has a "7". The "P" in the upper right means it's a "P-Frame", which is why it's colored blue, as described in the main VGS key help. The "5:48" in the upper right indicates that this frame occurs located 5 minutes and 48 seconds into the video.
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