It is possible to modify the size of the text box in your Forms. This text box is where reviewers would input their responses for Text type questions.
Go to Workflow > Edit Forms and select the Form of interest. Open the Question Editor for your Text type question. You will see Rows and Columns fields at the bottom, which are customizable based on your preferences. The default setting is a 1x30 dimension, so a short line of text is visible. If you would like a larger space and easier-to-view text responses, you can increase the size of the text box to 10x30 (rows x columns), for example.
The following screenshot displays the 10x30 size text box for Text type questions: