If you are already using a product or feature that is available as an add-on, it will appear in your Add-on Library as Added. There is no additional cost to use add-ons that you are already subscribed to.
There are a couple of reasons why you may not be able to manage your Add-on Library.
Only the account owner and Full Access Team Members can add or remove add-ons. If another team member needs to add or remove add-ons, you can grant them permission to Manage subscriptions to Square services and Add-ons in the Account & Settings section of their permission set.
Another reason is that some add-ons may be connected to a paid subscription. You will need to unsubscribe via your online Square Dashboard before removing the add-on. Once the subscription ends, you can remove the add-on from your Square Point of Sale app.
Cash drawer management is only available on Android tablets, iPads or your Square Register. You can add the Cash Management Add-on to your Add-on Library using any device, but you will need to use the feature on a compatible device.