Can you export the Feature Manager Tree to .csv file? Or copy the contents to the Windows clipboard?
Have you looked at Tree House or you can use the snipping tool.
The only way I know is a screen shot of it using the Snipping Tool (as Tony said) or one of the similar tools - I use Lightshot.
If part feature tree, then check the "Feature Tree to Clipboard" macro in this post Anyone know how to export the feature tree to excel?
Retrieving data ...