Learn Italian: Puoi configurare questa impostazione come vuoi. - You can configure this setting however you want.

This is a great catch! You are learning that per quanto translates to "however" when it implies "no matter how" (as in "however hard you try"). But in this sentence, "however" just means "in whatever way" or "as." Italian translates this simply as come, which doesn't require the subjunctive.

If I used the lesson's grammar and said per quanto tu voglia, how would that change the meaning?

It would change the focus from the manner in which you do something to the amount or duration. Puoi configurare questa impostazione per quanto tu voglia would mean "You can configure this setting as much as you want" or "for as long as you want."

Why doesn't come vuoi take the subjunctive? Shouldn't indefinite ideas like "however you want" use it?

While Italian does use the subjunctive for many indefinite expressions (like chiunque for "whoever"), come vuoi is treated as a fixed, everyday phrase that takes the indicative. Saying come tu voglia isn't strictly ungrammatical, but it sounds unnaturally formal or archaic in modern Italian.

The word impostazione looks like "imposition". Does it always mean "setting"?