can't enlarge font size on IE11

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On the computer which have Internet Exploler 11, When opening a DAISY 2.02 book which have UTF-8 text, font enlarge button of AMIS 3.1.3 doesn't work.
How can I solve the probrem?

AMIS is known to have compatibility issues with IE 11. You may uninstall the IE 11 update and roll it back to use AMIS with full function on that PC.

Thank you for the answer.
I heard from a developer of Microsoft Japan that if the issue is clear, they can work to change IE11. But the problem is that it only happens with AMIS.
For the moment, I will ask end user if they can uninstall IE11.