I have new icon on assembler but it doesn't zoom at all, 3x3 as vanilla, I take rock items to see which button change size of placing and it works, on assembler or drill - it doesn't.

UPD: in describtion, make more sentences in USAGE , where u will write about technologies before USAGE..

Each resized machine is unlocked by technology immediately following the base machine, and accessible via hotkey (the same hotkey for increasing/decreasing tile size, defaults to Numpad+ and Numpad- in vanilla) when holding the base item in the cursor.

I feel like the very first line under the "Usage" section describes exactly how it works (at least it does in English, in case you are using a translator)

It describes very specifically that the resized machines (i.e. the "mini" machines) are unlocked by the technology that follows the base machine (i.e. they are unlocked by a followup tech after the base machine tech), and only then is the hotkey functionality explained (which means you must have read the technology part of the sentence before the hotkey functionality part of the sentence)

I'm not sure how to convey this information any more clearly (without polluting the in-game interface with a long description on every resizable machine)