Applying filter to composite of layers

[Egregius ([Greg] (Micro 4/3 + Win11))]

Welcome, Ilya. Hopefully someone here knows the answer to your question.

FYI, this is a double post. I’m guessing that as you are new to posting there was a delay in seeing your first post on the forum. Quite understandable.

applying filters to composite of multiple layers in PS22 and Nik 3.3

My apologies if this is a double posting, new to forum. Somewhere in Nik settings there is a button allowing to apply Nik filters to a composite of multiple layers or to the current layer only. Somehow it got reset and I cannot find it… Now only the current layer in PS opens in Nik - not the composite. Any suggestions/help? Thanks in advance!