There are two different ways that you can limit or organize the data you are looking at in your funnel: filtering by property in your funnel creation, or grouping the results of the funnel by property.
When you are building your filter, you can choose to filter a step by a particular property by click Add Filter next to the event name. This limits the data that you will see in the funnel to events with that property.
Multiple property filters can be chosen for each step in your funnel. Free Mixpanel plans can only apply up to two filters, while Paid Mixpanel plans can apply as many filters as they like.
You can add as many filters as you like to an event by clicking the small + button at the bottom of the list.
You can select whether you would like the user to match any of these filters, or all of the filters.
Grouping by property, on the other hand, is something that you can choose to do in the results of the funnel. Select the property you want to group by in the Overview section below the funnel to see how your users operate in the funnel depending on city, country, browser type, etc.
This feature is useful for determining if a group factor such as browser type is having an impact on your conversion rates. For example, if there is a bug in your software on Firefox, you might see a decreased conversion rate in the Firefox group.
You can also choose to filter that grouping to a specific city or several cities using the > arrow button.