Spiffy Plugins

It may be that your file is too large, try breaking it into smaller pieces. Please see https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-link-you-followed-has-expired-error-in-wordpress/.

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Interesting question. I came up with the following PHP snippet that could be added to functions.php. I ran it using the Code Snippets plugin, but you can choose to add it any way you like. This snippet replaces the calendar output function with a simple message.

<?php
add_action( 'plugins_loaded', 'spiffy_views_override' );

function spiffy_views_override() {
	global $spiffy_calendar_views;
	
	if (class_exists("SPIFFYCAL_Views")) {
		class SPIFFYCAL_Views_Extended extends SPIFFYCAL_Views {
	
			// Main calendar output
			function calendar($cat_list = '', $title = '') {
				return "This is the calendar";
			}
		}
		
	    $spiffy_calendar_views = new SPIFFYCAL_Views_Extended;
	}
}
?>

You have 3 options. Enter the new rule in any one of these places:

Customize > Additional CSS

Spiffy Calendar > Options > Custom CSS styles

Customize > Spiffy Calendar > Custom CSS styles

It is probably a style conflict with your theme. Can you provide a link so I can see?

The shortcode would be

[spiffy-calendar cat_list="2"]

Yes, that is what this setting will accomplish. The viewport width on a mobile device varies. Try setting the option to 600, and all devices smaller than 600 pixels wide will show the list.