Please follow the instructions below to reset Safari:

  • Open your Safari web browser by clicking on the Safari icon in the dock.
  • Click on Safari in your Safari menu, located at the top of your screen.
  • A drop-down menu will now appear. Choose the option labeled "Clear History"
  • A warning dialog will now appear detailing the items that will be removed.

Reference:  https://support.apple.com/en-us/HT204098