How assign different material to strokes in grease pencil mode

How can I assing different material to strokes? I was drawing strokes (see picture) using material named "face1" but want to change it to material "face", how can I do it? Or the only way is to to

How assign different material to strokes in grease pencil mode

How do I use Grease pencil fill tool so that it doesn't bleed out

animation - Why does my grease pencil's filled outline turn black

Grease Pencil in Blender 2.8 - Introduction [ENG]

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Grease pencil behind 3d object works in camera view. In render

How to edit the transparency of the grease pencil stroke? - Basics

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