Step 1: Open Text Edit on your Mac. You will see the text styling toolbar on top of the window.
Step 2: Go to Text Edit -> Preferences
Step 3: Under “New Document,” check “Plain Text.”
Step 4: Under “Open and Save,” check “Ignore Rich Text Commands in HTML files.”
Step 5: Close the current file (that has the styles on top of the window). Open a new file. The new file window should look like below.