How do I display a sequence as plain text?
Click the "Use an alternative format" button

In Sequence view, click the "Use an alternative format" button in the side toolbar to toggle display the sequence in "Compact Format".

By default, compact text-only format will be shown. If the "Show Features" button in the side toolbar is toggled on then sequence is colored based on any associated features.

If a 3 or 10 "block" format is displayed, click the drop down menu on the "Use an alternative format" button and choose "Compact Format".