It holds the tranny in first gear until maximum RPMs.
It will hold it in every gear to max RPMs all the way up if the track you are running is long enough.
Or you can let it go up as you approach whtever max shift points you like up to redline. Just relalease the shifter right a sec, pull left and hold to next shift point.
Depending on your tune and mods;
Pedal to the floor puts you in triple digits in or near the quartermile. Should be in fourth by then.
Be sure the road in front of you is long enough.
If you haven't been doing this before you were driving the equivalent of an expensive NA.
Once you get the hang of this tranny you won't believe what you were missing.
Now, enjoy your new car.
roadster with a stick
BTW, You might go ahead and read this part of the manual also. Just don't tell anybody and your pride is safe.