I'm having a senior moment,
My GUI is on it's on layer with scrollrate 0 and if I change the window size How can I reposition that LAYER to the horizontal center? (Without having to move each object individually)
Are you wanting to change the window size at run time?
If so, try putting all your Gui stuff into a family and set the position of that.
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Would be handy to have an offset option, that would be awesome.