Poor quality images

Hi, I have just upgraded from a M1 Macbook to an M3. I set it up as a new Mac and installed LIghtroom CC, all my images synced from the cloud but the quality seems to be poor when you zoom in. How can I fix this? I allready ticked, store previews locally. I dont want to store copies of all the origional on the Mac due to lack of disk space. Any help apparticated. Thanks Dan