Increase font size

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I have recently upgraded to Windows 10 and returned to my Daisy books after a break but the font is coming up as small size. The increase font size button increases the font size for the index but not the main body of the text. Is this connected to the upgrade to Windows 10?

AMIS has not been updated to work on Windows 10. If this limitation is critical for you, then you may consider using other DAISY players. A listing of DAISY reading tools is on the DAISY website