I am helping someone to create a beamer presentation and due to some physical disabilities, they would like to be able to use the beamer navigation symbols on a touchscreen to advance slides, rather than a keyboard or mouse. However, the navigation symbols are quite small and difficult to press accurately, so they would like to increase the size of the buttons. I've checked the documentation and other questions here on SE but I haven't been able to find any solutions. Is there a way to increase the size of the buttons or am I out of luck?

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