Slitherine

Is the multi colored tile thing new or did I somehow accidentally turn it on? Either way, can I turn it off somehow and go back to the white shading that shows up when I select a unit? It is pretty distracting the way it is now.

I believe its the shortcut to activate view lines of units, the different colours represent the percentage chance of hitting a target at that distance, without factoring in the cover mechanics, which are added afterwards.
Press one "1" to display/hide it.