Just wanted to note that although it’s not exactly what you’re suggesting here (which would be a more user-friendly way of doing this, similar to this other suggestion), you can filter by masterbundle if you know which one has the content you’re looking for.
Option 1 – Masterbundle Filter
Use mb: to filter by masterbundle. For example, mb:core would only show objects from core.masterbundle (vanilla content). You can combine filters such as fire mb:core to only view vanilla objects with “Fire” in their name.
Option 2 – Favorite Searches
Create a text file with a list of filters (separate by newlines). Use fv: to filter by this file. For example, fv:example would only show objects from the example.txt file. Similar to the previous option, you can combine filters such as mb.