When an example sentence sits right up against the answer with no space, the two blur together the moment you flip the card. You want to check the answer and move on, but the example sentence catches your eye too, and it slows the whole review down.
The fix is simple: add one blank line between pieces of information that don't belong together — between the answer and the example sentence, or between the example sentence and a note. Because the eye naturally reads things that are close together as one group, a bit of space alone is enough to signal "the answer ends here, and this is supplementary."
In ankieditor, click an element in the preview to select it, and a "Space below" row appears under the selection. Click ➕ to add one blank line below that element each time, or ➖ to remove one — the current count is shown in between.
One thing to watch out for — adding space between every single field cancels out the effect and just makes the card longer. The trick is to keep things that should read as one group close together (a word and its pronunciation), and only add space between things that should read as separate (an answer and an example sentence). By the way, if it's the lines within a paragraph that feel cramped, that's a job for line height, not spacing between fields.