I can't select "Fix position when scrolling"

I want to fix the header part, but for some reason I can’t select “Fix position when scrolling”.
Please help if anyone knows what is going on.

I’ve attached a screenshot of my figma screen. It’s in Japanese, but I’ve included a translation.

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I did what you said and then pinned the object and it worked.

This might be just the beginning…haha
Thank you so much!

Did not work. FIGMAI’m trying to solve this for 1 hour by now, no answers found!