I have done this before and it stops me from shifting to 1st gear, Turn the Low limit screw in until it stops shifting into 1st gear. Don't need that low of a gear for any of my riding.
I don't understand why would anyone want intentionally limit the functionality of the drivetrain without gaining anything ... Sorry mate, but this is not something worth sharing ...
If you don't need/use the 1st gear then you should consider replacing front chainring with a bigger one ...
Ive done this ... Took a 11 speed doer cassette (was 1/2 the price of sram) and limit the screw as my GX 11 speed can shift to a 51 ...
Bonus is I not have a 45 as a top gear vs the 42 on a sram.