Here is the solution I found here.
FTransform NextTransform;
if (TimeElapsed < ScreenInterpSpeed)
{
NextTransform = UKismetMathLibrary::TLerp(StartTransform, TargetTransform, TimeElapsed / LerpDuration);
ScreenMesh->SetWorldTransform(NextTransform);
TimeElapsed += DeltaTime;
}
@eldany.uy many thanks for your help !