In 13.23.5 we made a couple of changes to make it easier to give focus back to the source file display using the mouse without losing the selection:
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Added Preferences / File Displays / Mouse / Allow file selection when clicking to give focus option. If turned off, clicking a file display that doesn't have input focus won't select/deselect files - instead, it will only gain the focus, and you'll need to click again to change file selections.
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Clicking the current source tab, or the background of the tab bar of the source file display, now gives input focus to the file display if it didn't already have it. Previously the file display would only get focus if it was the destination and the click switched it to the source.