dotfiles/.config/micro/plug/detectindent/help/detectindent.md

Detectindent

Whenever a file is opened, the detectindent plugin tries to automatically detect its indentation style (spaces or tabs) and set the tabstospaces option accordingly. If spaces indentation is detected, it also tries to detect the indentation width and set the tabsize option accordingly.

To disable it, just turn off the plugin:

set detectindent off