If you consider to submit blank:

If you are thinking of submitting blank, click on options in the right corner (three horizontal lines):

When you enter the options, click on "Submit blank":

When you have clicked on "Submit blank", the following image will appear:

Keep in mind that if you submit blank, everything you have written will be deleted (reset) and cannot be recovered.

If you want to continue despite this, click on "Submit blank now". When you click, your exam is submitted blank and the teacher will not be able to see any of your answers at the time of grading.