Recommended setting for A2 threshold so UE can release sgNB in poor RF condition?

Hi.

For NSA, there is feature A2 based sgnb release.
What is general recommended setting for A2 threshold so UE can release sgNB in poor RF condition?

It should be lower than the B1 threshold otherwise performance will be degraded.

So, it depends on the B1 event settings in your network.