You can see this in the app by heading to your ISA from the Invest tab, then tap the 3 horizontal dots in the top right hand corner. Please bear in mind though, that this only applies to the ISA you have with CIRCA5000.
We wouldn’t know if you have contributed to any other kinds of ISA with another provider, or how much. Always make sure to check with your other provider too, for example if you also hold a Cash ISA or a Lifetime ISA. Your ISA allowance is £20,000 per tax year in total, across all types of ISA.
It is your own responsibility to make sure you don't exceed your allowance across any different ISA products you may have.