Access this setting by pressing the Settings cog in the bottom left corner of the screen:
Available on certain devices where standard settings may be too small or too large for the display. Examples include large-screen display panels and very-high resolution laptop monitors.
Use the slider to enlarge or reduce the display size - use the Preview tile below to gauge the required size.
Press 'Apply' to confirm your change.
To reset the display to default resolution, use the 'Reset to default' button.