While Roseannes season 10 revival was a success, Roseanne Barr’s return was short-lived, with the actress being forced out before it became The Conners. The tale of a working-class family and their outspoken titular matriarch, Roseanne provided a star-making role for its leading lady. As Roseanne Conner, comedian Roseanne Barr became a household name. Roseanne also boosted the careers of its stars John Goodman and Laurie Metcalf, and the show launched Sara Gilbert and Johnny Galecki to sitcom stardom. However, this did not last through to Roseannes final outing.

https://screenrant.com/why-roseanne-was-fired-conners-exit-explained/