Can I resize the texture pattern that applied via Illustrator graphic styles? And if not, is there any workaround to achieve this?
Sometimes, but it depends on the graphic style you're trying to scale.
Graphic Styles are just a collection of filters. You can edit the filters by expanding the Fill of the object the style is applied to (in the
To scale this Graphic Style, we can click on the
Stained Glass effect and edit the cell size:
This will increase the size of the "stones" in the Graphic Style:
It will be a different setting to tweak for each Graphic Style since they are all different, but this should put you on the right track.