When using Microsoft Internet Explorer web browser with Sitecore XP, the Workbox vertical scrollbar might be hidden. Sometimes, this makes it impossible to see, review, and manage items that are currently in the workflow.
To show the Workbox vertical scrollbar, consider the following option:
<FormPage Application="Workbox" Title="Workbox">to this one
<FormPage Application="Workbox" Title="Workbox" scroll="yes">