Access function parameters from material instance

Development Programming & Scripting Blueprint
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I’m currently working on my first master landscape material. I want to make everything more compact using functions. I saw in tutorials that I can change parameters of function from material instance where I use function (for example in this How to INSTANTLY TEXTURE your landscapes in UE4 - Unreal Engine tutorial - YouTube from 4:01 to 4:47)
For some reason I don’t see my parameters located inside the function in material instance. What can with it?
UPD: Screenshots in comments

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My Material (function is selected)

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Material function

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Properties of parameter (they are the same for every parameter)

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Material instance of first material without options from function

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He still uses normal inputs. But in my link author somehow directly managed parameters that are inside the function without inputting them from outside