The standard popup theme adapts automatically:

• Image only (no title, no content): a tall image card with a floating close button and an optional CTA button below.
• Image + content: image on one side, text on the other (half/half).
• Image + title: header bar with the title and close button, image shown below it, with an optional CTA button.
• Title + content, no image: header bar with the title, centred text body below.
• Image + title + content: image on one side; the title appears above the text on the other side, with a floating close button over the image rather than a separate header bar.

The CTA button uses your primary colour unless you set its own background/text colours. Popup Settings - Theme currently offers only the normal layout (it is the only file in that folder).