What is the blue bar on the right of the screen?

The Sentence Control Bar

The sentence control bar is a feature that allows users to modify a paraphrased sentence in a variety of ways. 

The sentence control bar appears as a blue colored column of icons on the right side of the output box. It is circled in red in this image:

Notice how the blue shade of the bar is the same as the highlighted sentence in the output. This is because the sentence control bar can directly affect the highlighted sentence. You can choose a sentence either by clicking on it, or by using the arrow buttons to the right of the Paraphrase/Rephrase button at the bottom of the interface.

There are four buttons in total on the sentence control bar:

• Copy Sentence: This allows you to copy only the sentence you have selected.
• Rephrase: This lets you paraphrase only the sentence you have selected.
• Undo last paraphrase: This undoes the last paraphrase on the sentence.
• Lock sentence: This prevents the paraphraser from making any changes in rephrasing to the sentence.