How to edit as plain text in Google Docs

[takuya_miyai]

This may have already been discussed, but I would like to know if there is a way to edit as plain text in Google Docs.

I understand that I can use add-ons such as StackEdit to edit in plain text, but I would like to edit in Docs for the following reasons.

* I use multiple GWS organization accounts, and adding add-ons to all of them would be a hassle.
* In some cases, accounts loaned to us by customers prohibit the addition of add-ons.

A specific use case is when AppSheet Automation generates a CSV file for backup and I want to modify the template file.
AppSheet generates templates for CSV files as plain text files.