How to use keyboard to change selection in dropdown box

My users need to be able to add data quickly (and preferably without switching from keyboard to mouse).In my add view, I have all the fields in the correct order so they can tab from one field to the next.
Some of the fields are dropdown boxes that are populated using lookup tables.I want the user to be able to press a key and have the dropdown box display the first value that starts with that letter, so that the user can select a value in the dropdown box using the keyboard.This worked in older versions of PHPMaker (by default). At least it worked in PHPMaker 2018.How can I achieve this? Any help is appreciated!

You may use native HTML SELECT elements, just enable Tools → Advanced Settings → Use native SELECT tag for select-one fields. (Assume v2022)

That solved it - thank you!!