I'm quite new to After Effects but I'm having an issue that I haven't had before. The preview pane is very low resolution and grainy which makes it really difficult to gauge what the end result will look like. It renders in high resolution but I cant seem to change the preview to make it higher resolution. I've put two screenshots to show what I mean. Not sure if you need to know any other info to help?
Your resolution is set to "Quarter". Set it back to "Full" or "Automatic".
Thank you! That's solved the issue