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You're mistaken by the name. Solid actually means solid color, which will make the sprite non-transparent. You can read next to it that this menu is known as "Blend Modes". You can tweak around with these settings to remove the sprites borders (I.E, black surroundings).
Sprites cannot themselves be collision detecting, but try this method out.
Put your sprite, blend it the way you want it to be. Next, select Func_DynWall. This is a dynamic wall, or in other words, an invisible wall. You can put these walls under your sprite to make them solid.