Is there a way to hide some fields on search dropdown? Basically what is happening right now all fields are being shown on the list.
You can do that in the following way:
1) Open the replacing object that is usually in the Custom package (in the configuration).
2) Open all settings of the object: http://prntscr.com/ioprlo
3) Then you can set the usage mode for the column is None.
Please note that if you set such usage mode for the column, you won't be able to filter the records by it but also you won't be able to add this field to be displayed in the tile or list view in the section.