How can I get a Gmail appearance such that all of the mails in my email tabs (Inbox, Sent Mail etc.) are visible in one window? I should be able to see all of my emails in one big window, without having to click on tabs on the left hand-side. I know it is possible because I have seen my friend do it, but I don't know how!
If I understand correctly what you want to accomplish, you should set your inbox to default and disable the categories tabbing.
- Click on the gear icon in the upper-right corner;
- Click on Settings;
- Go to the Inbox tab (the third one);
- For Inbox Type choose Default;
- Deselect any other option except Primary from the Categories;
- Click Save Changes at the bottom of the page.
That’s for an all-incoming-mail-in-the-same-window inbox. Otherwise, if you want to see absolutely everything, including chats, archived emails and what’s under your labels as well, go to All Mail from the left-hand side menu (under Inbox, Sent Mail etc.).
That's probably the "All Mail" item.
All Mail is your archive, a storage place for all the mail you've ever sent or received, but have not deleted.
You can see a list of archived messages by clicking All Mail. If the All Mail link is not visible by default in your inbox, click on the More dropdown menu under your Labels list to visualize it. Archived messages are also available by searching, and under any assigned labels.
"All mail" shows all of your mail messages, no matter what their label(s) might be1 except for the message in your Spam and Trash buckets.
1 "Inbox" is just a label, albeit a special one.