How to select the weather icons folder: 64x64 or 128x128? (1 Viewer)

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I can see there are two sets of icons in my C:\Program Files\Team MediaPortal\MediaPortal\weather\ folder: 128x128 and 64x64. My dual screen monitors resolutions are 1744x972 and 1440x900. My system defaults to 64x64 icons, but they look very small on my screen. I manually replaced all files in 64x64 folder with 128x128 files and the new icons looks big enough to me.

Now I wonder how I can do it properly. Is there a way to select the 128x128 folder as a default folder for my weather icons?

Thank you.