There are a number of options to provide feedback or obtain further information.
My Esri
My Esri is a website that allows you to interact with Esri to answer questions, post feedback, and obtain information. The website also contains frequently asked questions, how-to instructions, software downloads, troubleshooting tips, and more. Sign in to the website with your Esri account to begin interacting with Esri. Alternatively, you can contact Customer Service or your local distributor.
Web help
Visit the ArcGIS Pro, ArcGIS Enterprise, and ArcGIS Developer websites for up-to-date information on ArcGIS software and services. These are invaluable resources that will help you expand your understanding of GIS technology.
Installed help
Downloads include the Install.htm help file. You can locate what you need by searching the table of contents, finding terms in the index, or finding the number of times a term appears in a section.