On the left, just go to "temporary places" and untick "mars" and you are back to earth.
Right click on it to delete it so that it doesnt get turned back on again accidentally, which could cause some confusion .
(More confusing than the lack of ice at the north pole

)
For best viewing of mars, turn off ALL other overlays on the left...
The correlation between the surface of mars and the surface of earth was completely arbitary - perhaps the overlay here has 0 longitude matching up and perhaps it doesnt ...