I used to have Gmail promotion tab grid view, and today I can't find the way to turn it on, the option is gone. The detail/grid button is gone and I can't find it in the option? Did Google remove the grid view??
'Twould appear to be so.
However, the grid view was a field trial and never "officially" part of the Gmail layout. I guess they decided that it had run its course and was no longer useful, so killed it.
I've not seen any sort of official announcement of its cancellation and, until I saw your question, had forgotten all about it and certainly have seen no other complaints about it online. I don't think it got used much.
That said, the announcement page and sign-up is still available, so maybe you only need to (re-) sign up. https://www.gmail.com/mail/help/fieldtrial.html
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I tried all the other gmail accounts which had Gmail grid view before, but now they're all gone. I'm going to sign up again see what happen..:/ – user3062756 Apr 21 '15 at 23:37