Search all field automatically

How do i remove the drop down list to search by and have the search performed on all available fields…

i.e. If i type Jones then it lists all the database entries that have Jones within first name, surname and telephone number…

If i type 01763261000 then it lists all the database entries that have 01763261000 within first name, surname and telephone number…

https://www.ads-software.com/plugins/participants-database/