Question about zRAM capacity

Even if I increase or decrease the capacity of zRAM, the device information app always shows 4GB. I wonder if the size of zRAM is fixed. For reference, I am using Nothing Phone (2) 8G/128G.

Even if I increase or decrease the capacity of zRAM, the device information app always shows 4GB. I wonder if the size of zRAM is fixed. For reference, I am using Nothing Phone (2) 8G/128G.