H2D Laser - Material Pins - don't understand this

Ok, I am talking about this article :

https://wiki.bambulab.com/en/h2/manual/laser-platform-cutting-platform-use-intro

So I am using material pins as attached but I honestly do not understand this English

The big material pins can only be installed on both sides of the laser platform, and cannot be vertically magnetically attracted on the grid panel, otherwise, the toolhead will be hit; the small material pins can be vertically magnetically attracted, but the operation requires extra attention, shen manually entering the material thickness in the software, it cannot be set to a thickness more than 2mm lower than the surface of the workpiece, and cannot turn on the focus sinking (see developer mode for details), otherwise, it will also cause the toolhead collision.

So what am I setting when I am using the small pins ? They also show a screenshot in the documentation - and that setting is nowhere to be seen. Nor do I see an option to enable developer settings

Can someone decipher this for me please ? I think this was written by a non native English speaker and I really struggle to ‘get it’.

Native speaker here. They show a large pin upright and cross it out as not even being viable. A small pin, in that similar orientation can work, although just barely. They caution you not to drop the focal point below -2mm of the actual surface the pin is attached to or else the head will attempt to move closer and will collide with the tail of that pin.

They did the math for you so you don’t have to hence just the -2mm reference and some random obscured reference to material thickness. Maybe that was an unwise choice.

Not sure I fully followed your setup, but if that’s how you have it arranged, I would suggest flipping the pegged bars upside down and using double-sided tape to secure the workpiece to the platform.