https://wccftech.com/xbox-series-s-and-x-get-120fps-support-for-a-bunch-of-ea-games/

Microsoft has recently added 120FPS support for several Electronic Arts games on its Xbox Series S and Xbox Series X consoles through the FPS Boost feature. These are Battlefield 4, Battlefield 1, Battlefield V, Titanfall, Titanfall 2, Star Wars Battlefront, Star Wars Battlefront II, Plants vs. Zombies Garden Warfare, Plants vs. Zombies Garden Warfare 2, Plants vs. Zombies: Battle for Neighborville, Mirror's Edge Catalyst, and Unravel Two. On the other hand, Sea of Solitude now supports 60FPS, whereas the original game only supported 30FPS.

Some of those games won't have 120FPS support enabled by default, though. That's where the team of Xbox engineers was forced to lower the rendering resolution of the game to allow for the high frame rate option. This tends to be the case for newer titles, which are more taxing on the hardware compared to older games like, say, the first Titanfall.