if I keep the area rug small do I just go to end of sectional or a little over

With tile floors, I'd go with the bigger sized rug.

The general rule of thumb for an area rug intended to anchor a seating area, it should be large enough so that at least the front legs are resting on the carpet. This avoids tripping, makes the setting gracious, and the space looks larger.

I am buying a new rug soon and was wondering the same thing!

these are concrete floors that I love! but I wanted a area rug to tie things together, the only problem is the back door where I let me dogs in and out..thank you for the advise I plan on putting a table against the wall between the two windows with pix above.. this is a new house and we are taking our time with things.