Even officials who entered the administration with a profile of their own — like Symone D. Sanders, a onetime CNN commentator who is now an adviser to Vice President Kamala Harris — have become less visible.

Ron Klain, the White House chief of staff, said the lack of well-known personalities in the West Wing was attributable to a tone Mr. Biden had set. But it was also a product of an experienced team of people, Mr. Klain said, many of whom had already proven themselves and were on their second tours in government.

“The vast majority of people here are career staff people, not principals from other sectors placed into White House staff jobs, so that’s the culture,” he said. Many of the staff were “parents of young kids who put their off-hours energy into being parents, not into staff drama.”

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