Under the Subscription tab, you can know how many users are subscribed to your plans. Navigate to the Subscription tab, go to the Total column, and click on the number displayed on each subscription plan. That number includes all Active users and in Trial users. That will allow you to not only know which users are in each plan but also change subscription-based issues for each user.
Once you click on the number of total users, the subscription plan page will open up, and all of your users will appear. On that page, you can Search customers, Export a CSV file with your users' data, resolve some subscription-related issues by clicking on the three vertical dots, and even access each user's profile page by clicking on the user's name.
If you want to search for a particular user so you can check their subscription plan or make some changes, navigate to the People tab, find the user and click Edit. Then click on Subscription. You can click on the three vertical dots to makes changes to their subscription.