Hi Nebuka, yes there is a setting for disabling perspective in the 3D view under Options > View > 3D View projection. Set it to 3D view projection: Parallel.

That will modify the 3D viewport for the current file. If you also want it off by default when you first start MoI, save off a .3dm file with it set how you want and then put in that .3dm file as the startup template under Options > General > "Template file".

- Michael