Search in all child collection not only in selected one

I have structure of collection like that:

  1. Col1
    • colA
      -col!
      -col@
    • colB
      -col!
      -col@
  2. col2
    • colA
    • colB
  3. col3

When i chose in windows app e.g. col1 and type something in searchbar it search only in col1, but it schould search cal1-colA, col1-colA-col!, col1-colA-col@, col1-colB… too.

similar is in android app and in browser extension.