The font for each is independent of the other, so you may want to set them differently to visually confirm the mode that the document opened in.

Click the Photoshop document and type the text. You can also double-click a text layer in the Layers pane, which highlights the text, and then use the font-size selector to increase the font size.

Google Docs has all the features you need to write a paper in MLA format, as well as a template to set one up automatically.