In the top right hand corner you'll see three dots in a horizontal line. Clicking here opens a drop down that reveals the settings option. Select "Settings".
Once in settings, select "Choose what to clear".
You'll reach a screen that has you check off what you'd like to clear. It is recommended that you check off the first four boxes (Browsing History, Cookies and saved website data, Cached data and files, and Download history). Next, click "Clear".
Now that you have cleared the browser history and cache it is recommended that you restart the program. Click the "X" in the top right hand corner.
You will need to restart your browser for the changes to take effect.