TextEdit on macOS is a basic text editor used to read and write text files with basic or no formatting.

Issue : Not able to save .txt text file with no formatting in TextEdit

Description : When you try and save using TextEdit there is no option to save as a .txt file

TextEdit No Save txt Option

Resolution : For a file that is currently opened you need to select Format > Make Plain Text

TextEdit Make Plain Text

For a long term solution, select TextEdit > Preferences… then change Format from Rich text to Plain text

TextEdit Preferences Change To Plain Text

This will ensure that the save dialog will allow the file to be saved as a plain text (.txt) file

TextEdit Save txt File