I can change the sharpness on whatever thing I connect to my RCA roku tv, but when I connect my pc, I can't, and the letter on the screen are a bit fuzzy, thank you already for the help
Just to make sure we understand the question...
You have a PC with an HDMI output, and are connecting your PC to an RCA brand Roku TV device via HDMI?
If so, what is the resolution of the PC? If you're running Windows 10, on the computer go to Settings > System > Display, and look at the Display Resolution setting on the computer.
DBDukesRoku Community Streaming ExpertNote: I am not a Roku employee.
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It is in native mode, 1080p
That wasn't the question. The question was about the resolution showing on your computer. It will likely have a width and height value.