The team has placed Search for the List App on the backlog. We will share an update as soon as one is available. In the meantime, you may want to try using filter as a workaround.
An error occurred while saving the commentKen Cromb commented
I planned to set up a simple acronym search list for my company and Lists looked perfect. However, the lack of an intuitive search facility with 500+ acronyms means the use of Lists has had to be abandoned. Please implement asap.