To type exponents on a Mac Google Docs, you can either use the keyboard shortcut or the equation editor feature.
To use the keyboard shortcut, press the "Option" and "6" keys simultaneously to insert a caret (^) symbol. Then type the number or letter you want to be the exponent. For example, typing "Option" + "6" + "2" will create a squared symbol.
To use the equation editor, go to the "Insert" tab in the top menu bar. Select the "Equation" option, which will open the equation editor window. You can then type your exponent equation in the text box, and it will be rendered correctly.
I hope this helps!