How to remove the customer id on the PCB?
For picking up your PCB easier, JLCPCB would add a very small Customer ID to your PCB and add the number by random, the number may be under some IC, if you solder the PCB, it will be hidden. But if you want to put it in a specific location, that's ok as long as you indicate in your file.
1. You can indicate this location by adding the text of "JLCJLCJLCJLC", and then make a note about it when you place your order so that we notice it, ot it maybe missed easily.
Note: Just "JLCJLCJLCJLC", No more or less characters. The font size should be larger than 0.8mm in height and 0.15 mm in width.
2. If you don't like it, when you place your order, you can choose Panel by JLCPCB https://support.jlcpcb.com/article/24-how-do-i-order-a-panel, we will add the string at the dirty edge by default, so there is no string on your product PCB.