Thank you rigmarole for the reply. I think I did misunderstand the use of “turn off tabs” options.
My problem is:
I want tabs button to create tab character. However, in my Ipad, the tab button work like a shift-tab. It move all the line from the start. And it also changes the line into red color.
I had thought there is a hot key defined with the tab button but it doesn’t.
I have just update to newest version macOS and it happened to macOS too.
I use safe mode so no community plugins are installed