Cursor location unable to click beyond the final period.

When trying to copy only one line in a note, I am unable to place my cursor beyond the end of the line. If my mouse doesn't sit in exactly the right spot, then the highlighted section gets incorrectly highlighted. Sometimes it highlights more than I want, and other times, it highlights less. I would like to be able to click in the space that is unoccupied by words at the end of a line of text, and click and drag from there, to highlight that line. Additionally, I am noticing lag in highlighting text and typing text. Not sure if this is my computer or not, but it only happens in this app, and doesn't happen in this "feature request".