Find function

I tried searching through my whole manuscript. It worked but I have the information window, telling me the word wasn’t found in the file and asking if it should search from the start, displayed for each text file in my manuscript folder. I have approximately 80 text files… Couldn’t it consider the selected folder as one big file?
Moreover, when the word is found it is displayed correctly, showing me the word highlighted in red in the middle of the page, if the next occurence is in an other text file it’s ok, but if the next occurence is in the same text it’s correctly highlighted but the page doesn’t move to show the word, I need to roll down myself searching for the word in red.
I hope I explained clearly enough. Thanks.