Il agit toujours à sa guise.

English Translation

He always does as he pleases.

à ma guise, à ta guise = as I / you, (etc.) please;
il n’en fait qu’à sa guise = he just does as he pleases ou likes
© Larousse 2014

All true, but I think this is considered old-fashioned. You probably won’t hear it much.

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perfect, good to know, thanks

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