Just bought (and now returning) a couple Roku sticks, Disney Plus and Amazon Prime app menus were blurry. Switched back to my old Amazon FireTV and the menus were crystal clear, fumbled with the settings for awhile to figure it out but gave up. Really wanted to keep the Roku like the remote better than firetv but the fuzzy menu icons drove me crazy. Hopefully this is something they can fix.
Can you please clarify the issue you are experiencing? Have you first made sure that the video settings on the Roku device are correct for your TV display? Have you tried using another HDMI port on your TV to see if you are still experiencing the issue? In addition, can you please provide a screenshot of the issue you are seeing so we can better understand the issue?