How do I find all files that contain two keywords in a file in IntelliJ?

Question

My question is a follow up question on the selected answer for How do I find all files that contain two keywords in a file?

Step 1: Search for the first string using Find in Path

Step 2: Click on the Open in Find Window button

Step 3: Search for the other string '/abc/defg' using Find in Path with, and this is the important part, the scope Files in Previous Search Result selected.

Below is what I see:

Step 1: search use 'Find in path' for 'math'

Step 2: clicking 'open in find window'

Step 3: doing another 'Find in path' for 'cost'

I am not seeing 'the scope Files in Previous Search Result selected' at all. Step 3 is just bring up the exact UI as step 1.

I am using community version 2021.1, but I am quite sure it's not the version but my operation. What can I try next?