Using a browser tool called Inspect Element, you can check to see which filters you used when you originally installed the plugin. If your goal is just to replace the plugin with one that uses different filters, use this tutorial to re-install it.

To see what's currently filtered though, navigate to the page of your website that your plugin is installed on. Make sure its the live version of your site, not the 'edit' page within your site builder. We'll use the Chrome browser for this example.

On your website, near the top of your plugin, right click > then choose Inspect.

This will pop in a side panel where you'll notice a faint line highlighting a section of the html code. Just above this section is the plugin code.

Using the Momence plugin page (Studio Setup > Add to Website) on the right for comparison, we can see that this default setting for the plugin (no filters applied) differs from what is running on the site.

On the site we're filtering for one teacher, who's Teacher ID is listed.

To replace the plugin with one that uses different filters, use this tutorial to re-install it.