Content, author, date and description in results
Layout options -> Results Layout -> Show author in results? / Show content in results? / ...
With these options you can enable/disable certain aspects in the results list. If you don't need the author, date, description in the results, just disable the corresponding option.
Default search placeholder text
Layout options -> Results Layout -> Default search text
By default there is no text in the search input area. You can however set it if you want to.