For the search checkboxes that appear with multiple search sources (example screenshot):

It would be helpful to default them to checked (since they are already showing up in the results by default), and do something like what DataDog does with their search where on hover over any individual source row a "Only" link will appear to quickly uncheck all other boxes except for the one being hovered over, or be able to uncheck individual boxes on the left side to remove one or more sources.

We are finding that we often want to filter out JIRA from our search results, which means we have to check all four other sources to see those results, but that could be done with a single unchecking of JIRA if all boxes were checked by default. This would be helpful :-)