First head to your Brightspace Landing page.
Next you will click the course you would like to head to. Either from the “My Courses” Widget or the “Waffle Icon” at the top of the Page.
Next you will Click the "Dropdown Arrow Button" under the more option.
Next you will click “Turn it off”
Next you will choose “Other” in the first Box and click “Done”
You are now back in the Classic Content Experience