What did God do when Adam and Eve hid after sinning?

After Adam and Eve sinned and hid, God did not abandon them. He came, found them, addressed Adam, and restored them. Their fig leaves could not make them fit to meet their righteous Creator, but God showed mercy and grace, revealing that grace was already evident in the Garden.

Les explains that Adam and Eve sinned by partaking of the forbidden tree, immediately saw their nakedness, and sewed fig leaves. When they heard the Lord coming, those fig leaves fell into nothing, so they ran and hid. God did not give up; He found them, saw them hiding, and called, 'Adam, where art thou?' Adam responded. Les emphasizes that God restored them, which is mercy and grace. This shows grace was already evident in the Garden, not something unknown until Paul. Les also notes God's mercy and grace kept Israel from destruction after the golden calf and after they rejected the Messiah, and it explains why God has forestalled destroying humanity.

Genesis 3:8

And they heard the voice of the LORD God walking in the garden in the cool of the day: and Adam and his wife hid themselves from the presence of the LORD God amongst the trees of the garden.

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Genesis 3:21

Unto Adam also and to his wife did the LORD God make coats of skins, and clothed them.

What did Adam and Eve do after they sinned in the garden, and who found them?

After sinning, Adam and Eve sewed fig leaves, then hid when they heard the Lord God in the garden toward evening. They did not run to meet Him; God had to find them. This illustrates that mankind will not seek God by his own volition; God must make the first move.