My home screen on my 55S451 Roku tv seems kinda small the icons or tiles are very small for the size of the tv.
Try performing a System Restart when this occurs.
Settings/System/Power/System Restart
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Not sure why this occurs to some users, but usually the System Restart fixes it. On the RokuTV, some notice it when changing between HDMI sources (especially when using game consoles).
The system restart worked for me, thanks