SICK AND EFFING TIRED OF LOSING DONUTS!!!
There is a Donut confirm option. Just click on the i on the right hand corner of the build menu. It will take you to a option screen where you can toggle the confirm option on or off.
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All I can say is that I've been playing for over a year and I haven't accidentally spent donuts once since I discovered the "Confirm" button. Not even once. Seriously, if it's an ongoing trait with you then you just need to slow down.
