I encountered an issue on MaterialTable's export button. It didn't show up in the table after adding <MaterialTable options={{exportButton: true}} />
I discovered that exportButton wasn't found in the Options interface, when I stepped into the options props in the MaterialTable. To tackle with this issue, I've tried to remove the node_modules folder and install it again.
Apparently, it doesn't seem to solve the issue. This is the list of the elements shown in my Options interface.

Try setting MaterialTable
optionslike this:Here is a link to a working sandbox.