1. Event Slider doesn’t have such functionality, I am afraid. However please create a new ticket and select Feature Request as category so others can vote on your idea and get it moved into development faster.
2. Unfortunately, Event Slider doesn’t support filtering.

WP Debugging plugin provides this when activated:
Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the evotx domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/yogainveradmin/public_html/wp-includes/functions.php on line 6114
Notice: Function _load_textdomain_just_in_time was called incorrectly. Translation loading for the page-builder-framework domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /home/yogainveradmin/public_html/wp-includes/functions.php on line 6114
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Please try adding event_past_future=”future” to both shortcodes.
“Sold Individually” only works for regular tickets without variations enabled.
The only settings that affect variations can be found on this modal window:

I added it here:
https://gaydesertguide.com/wp-admin/post.php?post=121120&action=edit

Please check and let me know.
The issue was coming from boosted-elements-progression plugin. If it’s working for you now, please wait for more updates.
https://helpdeskx.s3.amazonaws.com/wp-content/uploads/2024/12/17202950/Screenshot-2024-12-18-102322.png
The screenshot still shows [add_eventon] shorcode, please replace it with Event Lists [add_eventon_list].
Try also adding this code:
.ajde_evcal_calendar.color.boxy #evcal_list .eventon_list_event .evoet_cx em.evocmd_button { color: white; background: red; }
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