Questions concerning swap partition on boot drive

[jaja27]

When installing TrueNAS Core (12.0-U8.1) on my system, I accepted to create a 16GB swap partition on the boot drive when the installer prompted me to do so (since my boot drive is a large NVME SSD). I can see the 16GB freebsd-swap partition when doing the command gpart list.

However, when doing the swapinfo command, I can only see 2x2GB of swap (I assume these are the swaps on the HDDs on my data pool).

Questions:

1. Is the 2GB default swap per HDD used for the same thing as the boot drive swap, or are they different kinds of swap ?
2. Is it normal that my 16GB swap on the boot drive does not show up with swapinfo and in the GUI (Reporting -> Memory -> Swap Utilization) ?
3. If not, how can I "activate" it ?
4. My boot drive is 64GB and 40 of them are unused. Is it possible to increase the boot drive swap (let's say from 16 to 32 GB) ?