How can I change multiple lines attribute to single line attributes?

Hi

I have a block which includes some Multiple lines attributes.

Now I don't want them to be multiple lines any more.

How can I change them to single line attribute?

In the block editor, the "Multiple lines" in the properties palette is gray out. I have create single line attribute and replace the multiple line attributes one by one.

Why don't make the Multiple lines property editable? This problem is since Multiple line attribute first time introduced.

Interesting thing is single line attributes can easily changed to multiple line attributes through the properties palette!