never mind that; don't worry about that — a colloquial phrase used to dismiss something or move the conversation on
そんな細かいことはいいから、本題に入りましょう。
Never mind those minor details — let's get to the main point.
説明はいいから、とにかく助けてくれ！
Don't bother explaining — just help me, please!
いいから早く行こう、時間がないんだ。
Never mind that, let's hurry — we don't have time.
listen up; used colloquially at the start of a command sentence to emphasize and get someone's attention (as in 'いいから聞け' or 'いいから来い')
いいから聞け、明日の予定は全部僕に任せておけ。
Listen up — leave all the plans for tomorrow to me.
いいからほら、早く食べなさい！
Come on, just eat quickly!
いいから黙って座りなさい。余計な口出しは要らない。
Just be quiet and sit down. No unnecessary comments.