You have to switch it manually unless the regulator knob is set to draw from both tanks at once, which is the middle position. That's not recommended because when you run out, you're completely out. Gassman's right, when one tank is empty, open the other tank's valve, turn the knob on the regulator to that tank before you unfasten the empty one, (that way no air gets in the line), and keep on cookin'.
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It's never too late to have a happy childhood!
Lee, WU0V, and Courtenay, N0ZDT
2011 Rockwood A128
2000 Silverado 1500 pickup
60W solar system
2000W inverter generator