Is it possible to triple-click without selecting the line break?
I’m doing a cookbook and need to change all the recipe headings, when doing so with triple-click it selects the text but also the line break with the result of the headings getting the next paragraph style.
The behavior of mouse clicks is built-in and not adjustable.
That said, if you apply a paragraph style this way, including or excluding the hard return at the end ("line break"? surely you are not using Shift-Returns there?), should not matter. A paragraph style is always applied to the entire paragraph, even if you click the cursor anywhere inside the paragraph.