NodeXL successfully starts up (NodeXL Pro menu is present in the ribbon), but “Document Actions” does not load.
For Microsoft Office 365 Users who find that the NodeXL Pro Graph Pane does not display, please follow these steps to activate the “Document Actions” pane:
Go to File->Options
In the “General” tab, under “User interface options”, select the second option “Optimize for compatibility”
For more details please refer to this URL: https://support.office.com/en-us/article/outlook-attachment-preview-failure-88020c8e-43ae-4582-9554-511fbaf0d138