when changing paper size from 6x4 to 5x7 and manually resetting the frame size (why manually). The image is still printed as a 6x4 image on a 5x7 paper I have to take it into Photshop to print.
Can you look into this
Can we assume you're using Single-image / Contact Sheet as your Layout Style at the top right, and that by "resetting the frame size" you mean switching the Lightroom Template from (1) 4x6 to (1) 5x7 at the top left.
If so, and assuming your image is still cropped to 4x6 in Develop, it seems like you'd want to have Zoom to Fill enabled in the Image Settings section at the right just below Layout Style so LR will crop off the ends of the 4x6 to fill the slightly more square 5x7 paper.
If this doesn't describe the situation and solution, please use Lightroom terms for what you're doing.