If you want to add selected fields to show based on previous answers, you can use logic and add more fields in the logic settings.

Let's see how to do this:

We have a form with a single-choice question, and 3 other fields (name, email, and address).

We want to show the name and address if the answer is option 1 and the name and email if the answer is option 2.

To do this, click on the question with option 1 and option 2 answers, logic tab will automatically open in the right sidebar. Click on it. Then click on + Add Rule and select that if the answer is option 1 then show name and address, click on + Add More Fields, and choose address too (like shown in the GIF below).

To add a condition when the answer is option 2 to show the name and email, scroll down on the logic tab click on + Add Conditions, and apply the same rule for name and email.

In the end, your logic tab should look like this: