Let Bygones Be Bygones

The sources I came across when learning this idiom

The idiom simply means:

to forgive someone for something done or for a disagreement and to forget about it — Merriam-Webster.com Dictionary, https://www.merriam-webster.com/dictionary/let%20bygones%20be%20bygones. Accessed 11/12/2023.

Is “Let Bygones Be Bygones” a common idiom? Let’s see what Bob the Canadian says to that question

Let Bygones Be Bygones (The Vocab Man)

I’ve made a short YouTube video about Let Bygones be Bygones