The Earth has not undergone any significant increase in volume since it formed. However, the Earth's surface has undergone significant changes due to processes such as plate tectonics, volcanic activity, and erosion. These processes have caused the formation of new crust and the recycling of old crust, leading to changes in the Earth's surface area. The Earth's interior is also constantly in flux, with heat being transferred from the core to the mantle and crust through processes such as convection and conduction. This heat transfer can cause changes in the size and shape of the Earth, but these changes are not significant enough to result in a noticeable increase in the planet's volume.

Here is an article from the NASA website with more information on the topic: https://www.nasa.gov/topics/earth/features/earth20110816.html
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