It may be best to reach out to Easy2Maps for support, but you could try adding some CSS to your site.
You can change this by going to the Appearance -> Customize section of the admin, and there is a tab labeled ‘Additional CSS’. If you go into the customizer, you can add some code like this to make the map container responsive to screen sizes. Please paste the code between the dashed lines into the stylesheet:
The support post ‘Responsive Map’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.