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Hi another solution is to modify the imageslider.scss for this:

(Prestashop 1.7.5.2, Base theme prestarocket-dev-tools) 

.slider-caption{
  position: absolute;
  top:10%;
  margin-bottom: 0;
  color: #000;
  @media (min-width: 768px) {
    left: 90px;
    max-width: 400px;
  }
  @media (max-width: 767px) {
    left: 9px;
    max-width: 170px;
    .display-1{
      font-size: 0.9rem;
    }
    h4{
      font-size: 0.5rem;
    }
  }
}