The main areas are shown in this image with descriptions below.
The Menu and Toolbar are much simpler than before. The options appear
above the panels when you need them.
On the left are icons to save, undo and redo, find a topic and find and replace.
Above the authoring area are the icons you will need as you work. They will change according to what you are working on.
On the right are icons to change your view, generate and hide the right
panel.
Edit replaces Design in earlier versions of Adobe RoboHelp.
Source replaces HTML in earlier versions of Adobe RoboHelp.
Preview lets you see
how the topic will appear in a browser.
The preview opens in the Authoring Area so no popup any more, it opens
in the same panel instantly.
Quick Generate opens
a list of your outputs.
Those shown with blue text have been generated previously .
If you don't need to change the settings, you just tick the outputs
you want to generate and click Generate.
The cog icon lets you access all your outputs if you do need to edit
the settings first or create a new output first.
This replaces Batch Generate in earlier versions.
Hide Right Panel lets you hide the panel to give you more space to work in.
In earlier versions of Adobe RoboHelp if you selected
text in Edit View and changed to Source, the source code was also selected.
In Adobe RoboHelp 2019
you can also select text in Source View and it will be selected when you
return to Edit View.
The left toolbar controls what is displayed in the panel alongside.
If you click the chevron icon, text labels display. Useful while you familiarize yourself with the icons. There is also bubble text when you hover over an icon. The selected icon is blue and the panel alongside displays the information related to your selection, Contents in the image above.
Click the links above to see how each feature works.
For simplicity, what you see here when you click an icon in the left toolbar is described in separate topics. See the links above or the Table of Contents.