fixing tiny font on laptop

[John White]

For some unknown reason, my lyx fonts on all files suddenly 
became too tiny to read. Internet says use mouse wheel to fix, 
which works fine (I borrowed one).  But my laptop doesn't have a 
mouse or a mouse wheel.  Any alternative way of getting normal 
font size back on a mouse-less laptop? I may not be able to 
borrow a mouse next time this happens.

John
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