To add search filters on Drupal 8, follow these steps:
1. Go to the Drupal admin panel.
2. Click on the “Structure” tab from the main menu.
3. Click on “Views” and select the view you want to add the search filter to.
4. Click on “Edit” for the view.
5. Click on the “Add” button next to “Filters” in the view edit screen.
6. Select the filter you want to add from the list of available filters.
7. Configure the filter according to your needs.
8. Save the changes to the view.
You can repeat these steps to add more search filters to the view. The search filters will now appear on the view page, allowing users to filter the search results based on their preferences.