その問題に関しては

as for that issue

→ 其の
phrase Rare #35,610
as for that issue A somewhat formal way to say “regarding that issue” or “as for that matter.” The は marks the issue as the topic of comparison or discussion.
JA: その問題に関しては、まだ結論が出ていません。
EN: As for that issue, no conclusion has been reached yet.

その問題に関しては実にいろいろな本がある

There are truly all kinds of books on that subject.

スミス博士はその問題に関してはだれよりも詳しい

Dr. Smith knows more about that issue than anyone else.

その問題に関してはあなたと意見が違う

I disagree with you on that issue.

その問題に関しては彼らは別の意見を持っている

They have a different opinion on that issue.