How to tell how much of your 1GB you’ve used

So you can see how much space you have free per project, but I can find no way to find out how much of the 1GB of storage is used. The manual doesn’t seem to say.

I’ve put a load of samples on mine and would really like to know how much space I have left.

Since it’s gotten no reply so far I’m going to guess there isn’t a way to check which seems like a spectacular oversight.