regulator circuit logic question

[john23]

Hello,In the photo shown in the attached link I have a circuit.
this circuit is only an example .
In page 11 we have a much simpler implemetation of tuning output shown in the link.
Two questions:
What is the logic of this trimmer and the capacitor  attached to it?
Its suppose to supply 3A at most to the output,How can we be sure that I_adj=3uA?
We can output 1A 2A 3A how can we be sure I_adj will remain 3uA?
Thanks.
https://ibb.co/JTWXWVS
https://ibb.co/CKtFM59W
https://www.analog.com/media/en/technical-documentation/data-sheets/1764fb.pdf

[AnalogTodd]

This is where you spend the time going through the data sheet. Page 4 says I_adj is typically 3uA, but a maximum of 10uA. Page 7 shows what it looks like as a function of temperature.

The value of R5 (4.1k) determines just how much effect I_adj has on your output voltage. With the typical 3uA, your output voltage increases by 12.3mV due to I_adj * R5. If I_adj were to go to 10uA, your output voltage would increase by 41mV. If you need a lower shift, reduce the value of resistor for R5.