Hi Brad,
Thank you for reaching out about the issue. I took a look at your site and the Event Category filter did display, though I had to scroll up to see it. I’m unfortunately not able to provide much more assistance with this due to the fact it is related to a theme conflict. More info on what we can help with can be found on our What support is provided for license holders? Knowledgebase article.
I would start by identifying the CSS class or ID using the ‘Inspect‘ tool, then add in the necessary code to get the ‘Event Category’ field displaying properly. If you’re unfamiliar with this process, please review this YouTube Video.
I too experience the filters staying closed when viewing on a smaller screen when testing on my setup, even when the ‘Filters Default State‘ option is set to ‘Yes‘ under Events > Settings > Filters. I’ve gone ahead and logged a bug report for the developers to review. A fix will be included in an upcoming maintenance release, so stay tuned to your WordPress admin dashboard and our Release Notes.
I’ve put in a request to get a temporary workaround, so please reply to this thread tomorrow to see if I was able to come up with anything. Thanks for your patience while we work to resolve the bug and have a great evening. Cheers!