Thin pool subscription question

Dear.

I have a question about the subscription of the thin pool to the vmax sorage.

I have for example the FC thin pool as follows:

FC Thin pool

The subscription is the 94%, I was removing luns the FC thin pool, but the susbscription not change, I thought it was going to decrease. Is there any process that I must carry out to see the change reflected? This thin pool is part of the fast policy

I thought that the subscription was formed by the luns that I cut and assigned to a thin pool, is it true?

I hope you can help me.

Regards

Damián Salerno