eoPortal's Tianwen-1 (China's first Mars Exploration Mission) shows the following graphic, caption and link.
It's often discussed that orbital plane changes are like certain table wines in that they are for lying down and avoiding. They are generally costly in delta-v. The image shows that the maneuver is likely done at the apoapsis of a 400 x 180,000 km orbit and so the cost has been minimized. At that distance the orbital velocity around Mars is only about
485 m/s 97 m/s and so at least several hundred tens of m/s of delta-v would be needed for such a large plane change.
Question: Why not enter directly into a high inclination orbit? From Earth wouldn't it just mean aiming a few thousand km higher at a distance of hundreds of millions of km? This plane change seems unnecessary and a bit costly to me at first glance (a bit of delta-v and an extra burn and maneuver).
Figure 10: Planned orbital trajectory at Mars. A scheme of the different orbits that the Chinese probe Tianwen-1 will use around Mars, with informations on the orbital parameters of each of them13