I have 3 ideas for search enhancement.
1, Search results with notebook information:
When the search results are listed, add the colored "@notebook_name" after it in same line. It is easy and quick way to find right one from the list.
2, Notebooks search:
When a notebook is highlighted from the left, the search will search for keywords under the highlighted notebook, including sub-notebooks.
3, Selected notebooks search:
Provide the notebook name checkboxes for selection, and search under these selected notebooks.
Thank you provide the best opensource software to us, I like Joplin, and I have 25739 notes and 226 notebooks in my knowledge base.