Sentiment hasn't moved from far-right to the center. If it feels like that to you, it sounds like your perspective changed because you moved from the center to the far-right.
It does appear that the Overton Window has shifted far to the right on immigration, such that far-right views are mainstream enough to be highly visible, and found in representatives of formerly or otherwise centrist parties. I consider this shift deplorable, but it's clear that it has happened.
