You used to be able to click on Draw Line and it would remain on until you clicked it off. Please bring this back. It is a pain to keep having to clicking every time you draw a line.
Adminmeaggarw (Admin, Adobe) commented
Please use Keep Tool Selected icon to keep the comment tool selected.
To use this, click on the drawing tool that you want to use, then select the pin icon which is the keep tool selected icon,
This will keep the tool selected unless you explicitly disable it by clicking on the icon again.
Hope this resolves your issue.