
I mean, in general this is a good idea, but here specifically it should help you make out fine details better, like text.

It's also a good idea to lower the sharpness control. Select the casting icon from inside the mobile app. This should help reduce input lag, the delay between you pressing a button and that action showing up on screen. Note: You do not need to open the matching channel on your Roku device to begin casting. In the Screen Mirroring settings, pick Screen Mirroring Mode and set it to either Prompt or Always Allow per your preference.
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It might be disabled automatically, but if the edges of your desktop are cutoff, dig deep into your TV's menus for something like "size" or "zoom." If you're gaming, also see if your TV has a game mode. On the Roku Home screen, select Settings and pick System > Screen Mirroring. On the TV side, make sure you disable your TV's overscan. If you're also trying to send audio, that might need to be switched on as well, either by clicking the speaker button in the lower right on Windows, or in System Preferences on Mac. Here’s what to expect with the setup process.

In theory this won't be an issue, but if you're finding text hard to read, or overall the image looks poor, make sure the laptop's output matches your TV's resolution. Fortunately, you’re able to Roku cast and screen mirror with Roku devices. Your TV and your laptop's screen are probably different resolutions. Best streaming device of 2020: Roku, Apple TV, Fire Stick, Nvidia Shield and more compared.Overscan: You're not seeing the whole picture on your TV.Why you need to turn down your TV's sharpness control.
