The LV control (mains side) fuse is on the control board.
The HV (lethal side) fuse is housed inside a plastic shell, next to the HV capacitor.
For both, the outer shell (microwave oven's cover) needs removal.
BUT:
Mains must be off, preferably about 15 minutes to allow HV capacitor to discharge through it's internal drain resistor.
AND:
There will probably be one or more security tamper-proof screws on the cover, to prevent accidental injury through electrocution.
WHY:
Microwave ovens are the most lethal household appliances to open when untrained hands poke around.
SUGGEST:
Get an experienced tech to check it out.
What makes you believe it's a fuse?
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