
This cannot be done with brew remove since Homebrew won’t have enough permissions but you can remove zsh manually: // 1.

To solve this issue I had to remove x86 compiled zsh that I installed via Homebrew. The new macOS Big Sur comes with zsh as a default shell so you don’t need to install it separately anymore. This was caused by the fact I already have been using zsh shell before and it was migrated over. One of the biggest confusion for me was the fact my shell would not run in arm64 mode. I went with the latter and this post summarizes my experience.

Since the existing Homebrew installation wouldn't allow my updating or installing packages anymore because of more restrictive OS permissions, I was faced with "update the x86 homebrew" or “use an experimental cutting-edge ARM build”. Comparing Chrome via Rosetta 2 and native arm64 build.
