When using the graphics
Raspberry Pi Configuration tool, or when using
raspi-config from the command line, the only option for setting the resolution is:
Default-preferred monitor settings.
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In my experience, when connecting to the Pi while headless using VNC all of the options become available.
If that doesn't work, you can try changing the
hdmi_mode= part in the
/boot/config.txt file. Do that according to this page.