Evolution has no intelligence. Are you saying it does?
It doesn’t require intelligence.
What it required to be evolved, is the ability for life to adapt, so that descendants may survive the given environment.
Evolution don’t occur randomly.
In the last Ice Age, or the most recent series of glaciation periods, some part of the northern hemisphere were covered in ice sheets, while other parts were untouched by ice sheets.
For instance, most of Canada that were below the polar circle, and only parts of the US were covered in ice sheets. Those animals lived in regions covered in ice, have to survive in regions where there are no summers for thousands or even tens of thousands of years. And that can only happened if they successfully survive in those regions.
The bears in North America, were divided between those living in regions covered in ice all years around, and those bears living in regions that still have annual winter and summer seasons.
The brown bears that were living in region covered in ice sheet, had to physically and genetically, not just in one generation, but in all succeeding generations afterward.
Gradually those brown bears changed, adapting better in the icy cold with each new generations, until the brown bears evolved into sister species, the polar bears.
It is more than just changing the fur from brown to white, although being able to naturally camouflage themselves, is one of the evolutionary changes that can occur over given time. But the changes is lot more than that.
The fur is more thicker, more suited for icy winds as well as providing better waterproofing, so it also protecting them from the icy water. And due to diet change, the polar bears eat a lot more fat, like from sea seals, so the polar bears retained body fat than the brown bears, and I remembered in my high school biology, body fat are better insulation to the cold than muscles.
With the fur and body fat, the polar bears are able to hunt all year long, since during the ice age, there are periods of no summer seasons, so the polar bears don’t require to hibernate, like their brown bears’ ancestors or contemporaries.
Their paws and claws had also changed, and differed from the brown bears, which give them more traction on ice.
The changes are natural and directed by their needs for survival, not by randomness, and not directed by intelligence of some invisible and mythological being.