I am using the 1.4.4 Input System package in Unity 2021.3 with the Third Person starter project that you can download into the Unity Hub.
It works great except for one thing. The camera follows the mouse movement until the mouse hits the edge of the screen. Then you can’t turn any further.
In a previous version (I think it was 1.4.2), the mouse would get captured by the app and you had to hit ESC to get the cursor to show up, but in that version the mouse wouldn’t work on any of the UI elements in the game even when the cursor was visible.
Now the mouse cursor is always visible and works on all UI elements, but has the problem stated above.