Also is it possible to change the size of the thumbnails on this page and to deactivate the pagination?
The size of the thumbnails is controlled by your WordPress theme. You can check the theme’s documentation to find out how to change the size of the thumbnails on post archives. The pagination is also something the theme adds, and you can adjust the number of posts per page (to avoid pagination) in the WordPress > Settings > Reading settings page (Blog pages show at most) option.
Alternatively, if you want to set different posts per page limits for different post types, you can add something like this to a site specific plugin:
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Support forum for Event Espresso 3 and Event Espresso 4.