OS: Linux Mint 20 (XFCE/xfce)
Some Mouse Models offer the H key for recentering, but it requires an object under the mouse when invoking it. If you want to turn around some empty point in space, place some new object there (e.g. a standard cube from Part workbench), place the mouse over the desired point of rotation, and hide or remove the object. Then start the turntable.