How to remove the toilet bowl that left a mark on the bathroom floor tiles

It may not be possible to remove it anymore, unless the bricks are replaced. I don't know what brick you use? According to the picture, it looks like an artificial microcrystalline or marble, if it is the above 2 kinds of imprints, it generally can't be removed, because the variegated color has penetrated into it, so how to deal with the color inside the surface can not be removed.

The reason for the imprint is that the floor tile is not stain-resistant, it has pores on the surface and absorbs dirt.

Try soaking it in toilet soap for a longer time.