Application Launcher suggestion when searching

When searching in Application Launcher, candidates are listed with the first one selected, press enter will launch the first candidate, it is convenient.

But when I press down arrow key before pressing enter, nothing happens, press down arrow key the second time, it selects the next candidate (i.e. the second candidate), it is not intuitive, it is better for the first pressing of down arrow key to move the selection to the next candidate.