Find and replace not working and not all the lines are fully seen

I bought your plug in and I am a user who cannot save the dates from a column with Find and Replace. I set 1500 strokes per page, but it gives me this mistake.
Error <p> A critical error on your website has occurred. Resolution of WordPress problems. </p>
Then other problem I find is that I can’t see all the strokes all the way. I tried to decrease the number of strokes per page, I also tried other browsers, I blocked me for slopes from the browser or to 100 strokes or little more, or but never see all up to the bottom.
Then I wanted to understand what Wrap Mode means?