All the models apart from 'Jungle Tree' are facing right which is not a problem, because they still seem to work with my game. But how can I change the 'Jungle Tree' to face right like the other models instead of left? I haven't made the Jungle Tree drastically different to the other models so I don't see why it is doing this
As far as I know you can't do that in Unity, when importing an object. You'd have to re-export your object with blender. You can either rotate the object itself, or while exporting, play with the settings on the left. There you can change which axis is "Up" and which one is "Forward".
Alternatively you can make the Jungle Tree child of an
Empty and rotate that by the required amount, but assuming you want to use other objects in a similar way, it can get messy.