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How to collapse function variables in Blueprint?

Hello. To put it quite simply, I was wondering how to group/hide variables of a function, similar to the Print String function. I have been digging around, but I cannot find out how to do this.

I'm sorry if the title is misleading, I don't know how else to phrase it.

This is what I mean. I want my own functions to be able to do this.

alt text

Clicking the arrow:

alt text

I tried putting in default values for my function's parameters, but that didn't work. Any help would be appreciated.

Thanks for reading.

Product Version: UE 4.16
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asked Jun 15 '17 at 05:24 PM in Blueprint Scripting

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