Acrobat App not working in MacOS

I am having triuble with Acrobat in Creative Cloud.  When I open a PDF I cannot edit it or do conversions etc.  When I press on one of the tools, (edit a PDF, Scan and OCR for example), the subsidiary menus do not apprear.  How do I get it to work as normal?  I have checked my Creative Cloud package and there are no updates outstanding.