Sentence cards basically test you in 2 ways: one plays the audio of the sentence and the goal is to understand what’s being said, and the other is the sentence just in text and the goal is to understand what’s written.
They’re helpful to see how vocabulary is used in context, and to practice some reading/speaking skills. You can also get some training on grammar.
I don’t find them ideal to learn vocabulary, simply because after a while, you memorize the sentence more than the vocabulary itself. At your level, I wouldn’t bother with them and just do the vocabulary cards.
A layout is basically a different way of studying. For example, “Vocab Meaning” has the vocab in the front of the card, and it tests you on the meaning. I’d recommend you “Vocab Meaning” and “Vocab Reading”, so that you get tested on vocab, much like how WK works. I would deactivate the other options.
Hopefully, the gif helps understand how it works.