Hi there,
We have an enhancement plan for this. However, I do not know when we will install the enhancement. In meantime, you could hide the components using css classes as shown below. Please note that this is not supported and you may run into issue.
.esri-time-slider__animation,
.esri-time-slider__min,
.esri-time-slider__max,
.esri-time-slider__previous,
.esri-time-slider__next{
display: none;
}