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〜に関して: regarding; concerning
N2 · 11 Formal and written style
Says what the topic is, formally.
Noun + に関して. More formal than 〜について. Often used in business and writing, and the modifying form is 〜に関する: 環境に関する本. Compare 〜について, which is general and used in speech too.
Examples
新製品の発売に関して、ご説明いたします。
I will explain regarding the release of the new product.
この件に関しては、後日改めてご連絡します。
About this matter, we will contact you again at a later date.