en_tn/2ch/20/32.md

He walked in the ways of Asa, his father; he did not turn away from them

This means that he lived in a way that pleased Yahweh as his father had done. Here "walking" is an idiom for the way a person lives and behaves. Alternate translation: "He did things that were pleasing to Yahweh, like his father Asa had done, and he did not stop doing those things" (See: rc://en/ta/man/jit/figs-explicit and rc://en/ta/man/jit/figs-idiom)

he did what was right in the eyes of Yahweh

The eyes here represent seeing, and seeing represents judgment. Yahweh saw and approved of Jehoshaphat's actions. See how you translated a similar phrase in 2 Chronicles 14:2. Alternate translation: "he did what Yahweh judged to be right" or "he did what Yahweh considered to be right" (See: rc://en/ta/man/jit/figs-metaphor)