I'm using Inbox by Gmail and want to print an entire conversation of about 50 emails. I can't find the button for printing the entire conversation (group of emails). Any hint?
Unfortunately, there is currently no way to print an entire conversation from Inbox. All you can do is print individual messages.
You'll need to switch to regular Gmail to print the whole conversation.
I suppose this is not surprising, since Inbox is still in Preview. You should use the "Feedback" option to let Google know that this is an important feature. Perhaps they'll prioritize it for the next set of enhancements.
You can print all conversations of a particular email by clicking the print symbol. Each conversation again has print option separately and it will be user's choice to decide whether whole conversation or a particular conversation to be printed.
Control + P is easiest way to achieve this.
After you select print option, Chrome browser provides you a very good option to Save as PDF also.