Which side of this board is the capacitor polarity indicating?
Look at the other capacitors around it and how they're oriented. Notice the thicker part of the circle on the negative side. Even ignoring the symbol in the center of the footprint, you can tell which side is positive and which is negative based on the context of the other caps.

Positive is the short line in the symbol, negative is the upside-down "U" cup shape going around the positive terminal.