Why does navigation disappear in Owl carousel 2 after 4 slides and how to fix it?

Question

Owl Carousel

Hello, with 4 slides navigation disappears, writes disable , but with 3 slides everything is fine. Why is it like this and how to fix it? Please provide a complete detailed answer.
PS: I found some one solution on the Internet, but I either didn’t understand it very well, or it didn’t work out that way.
$(".next-review").click(function() {
owl_review.trigger('owl.next');
});
$(".prev-review").click(function() {
owl_review.trigger('owl.prev');
});