If you have paid for the Pro plan but you cannot access the Pro features, the first thing to do is to check your login. You need to log in to Photoroom using the same email address that you used for purchasing the subscription (this is the store account on mobile devices).
If the login is correct, the next step is to check your payment details are up-to-date. A common reason for Pro features being unavailable is that the payment card associated with your account has expired.
To update your payment details on the Web App, select your profile avatar. Then select Your Billing and then Manage Subscription.
For information on updating your payment details on mobile, see:
If your payment details are up-to-date and correct, you may need to Restore your Pro subscription.
To learn how to use a Photoroom Pro account on several devices, see How to use the same Photoroom account with multiple devices/platforms.