For your immediate problem perhaps a mini cheat might work for you.
Revit curtain wall door handle not there.
This video demonstrates the following.
Press tab until the panel is highlighted and then click to select the panel.
In the type selector select a curtain wall door to replace the panel.
I could indulge in a rant about all the problems with revit legends.
Add embedded curtain walls.
I am using the default curtain wall door that came with revit and not customized.
Only curtain wall doors can replace a curtain wall panel.
I would like to ask on why i can t see my door handle of my curtain wall door when i place it on my curtain wall.
When performing the procedures you may notice minor differences in functionality and user interface.
Also when the cursor is over the curtain wall in the canvas you are not able to place a door.
Modify the grid pattern of a curtain wall.
Press tab until the panel is highlighted and then click to select the panel.
Instead select the modify tool and position the cursor over the edge of the curtain wall panel that will be replaced by the door.
In part 8 of the tutorial you place a curtain wall at the store entry.
Add a curtain wall at the entry.
Save for another time.
Click the pin icon to unpin the panel.
This video was recorded using revit lt 2020.
Generally our curtain wall doors have a companion regular door not by design but rather by accident as we keep making families.
Instead select the modify tool and position the cursor over the edge of the curtain wall panel that will be replaced by the door.
Press tab until the panel highlights and then click to select it and display the pin icon.