Generally orbital inclination change is said to be (fuel) expensive. What is the biggest orbital inclination change (in degrees) done in Earth's orbit for an orbiting object? Can this be broken down by orbits (LEO, geostationary etc.) and by mission (commercial satellite, military/governmental, human spaceflight etc.)?
For low-earth orbit satellites, the IXPE satellite was launched from Canaveral to a 28.5 degree orbit. The 2nd stage of the falcon rocket then changed its inclination to a 0.2 degree, equatorial, orbit.
This odd maneuver was done to prevent the sensitive x-ray payload of the satellite from being exposed to the South Atlantic anomaly.
For more on that see: