You don’t need to manually increase it, that’s what the notification is there for.
It notifies you the transient pool has been increased by size because it was necessary. IF you want to keep this size, copy it to the persistent pool.
Note: “IF” - There are probably situations when you do NOT want to make the persistent pool this size, e.g. if it’s a temporary increase caused by some temporary changes.
You have to do nothing if you do not want to have a persistent pool. If, the only thing you have to do is to adjust it to the max size you want.
The notification is a bit stupid because it notifies you with each update, but what ever. Once the transient pool has reached the max usage, it will stop.