Disabling line buttons in EPM

Hi. I am setting up SPA514G phones, one of which has two SPA500S expansion modules. In EPM, when I leave the line key parameters blank for the SPA514G, the buttons do not disable, and the button lights continue to glow green. For the SPA500S module, when I leave the line key fields blank, the button lights go off. Is there a method that I can use to disable the buttons on the SPA514G without having to add lines to the basefile?

FreePBX 13.0.197
EPM 13.0.118.28

Thanks.

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