Reading Attack Start-Up & Frame Advantage Info
This option can be turned on/off in Training Menu > Info Display Settings > Attack Start-Up & Frame Advantage Info.
It doesn't display stored data of Start-Up and Frame Advantage for each move, but instead calculates them in real time.
Attack Start-Up
Shows the amount of frames it took from the moment the character performs an attack until the frame that they make contact with their opponent. Hitting late into a move or delay cancels (through meaties or other means) will show "incorrect" Start-Up as it's displaying the meaty frame.
Delay cancel or kara cancel will also lead to incorrect Start-Up. If you input 23L~6, effectively kara canceling 2L into 236L, then Start-Up will include the few frames of 2L that got canceled.
Frame Advantage
Showing the frame difference between both characters until they are "actionable".
I don't really know how to explain it scientifically so let's just look at a few examples.
Example 1
Example 2
Example 3

214L total animation takes 43 frames, but it's cancelable into normals starting on frame 14. The game considers "cancelable into normals" as actionable, so Trunks is 13 frames behind, and can "act" on frame 14 onward.
What do the numbers inside the brackets mean?
The 2 numbers only become desynced if a character changes their grounded/airborne state:
- Numbers outside brackets = Frame adv after they become airborne
- Numbers inside brackets = Frame adv after they land the ground
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