Not sure what version you are using, but that is not how PowerShell does completion for me. If I type in `Get-Package` for example and hit tab, I get printed a grid of the possible completions. Then I keep typing until it's not ambiguous, at which point it will complete the whole command. If there are hundreds of suggestions, it will ask if I really want to see them all.

I am running PowerShell 6.1.0 (which I think uses PSReadline). PSReadline is also very customisable, but this is the default behaviour.