Since the update this past week (October 2018), Adobe has made it harder to find things that used to be easy to find, and now it takes forever or completely lags when I try to find whether I have sent something to someone using the interface on my desktop for the old Send and Track feature (which apparently is now called 'Share' another renaming that threw me off this week). As a small business owner, I don't have time for this bull. If you're going to rename things, send us a required video for viewing of changes you're making and where everything is going than just springing it on us. The last iteration of this software wasn't perfect, but it was a lot better than this.
Apologies for the inconvenience.
You can check the page https://helpx.adobe.com/acrobat/using/whats-new.html for details related to changes made in the latest update of Acrobat to avoid such confusion.
I hope this resolves your issue.
Do let us know in case of any other issue.