Tags view should have both options, - new one, which will be well aligned with mobile look and feel, - and old one, - full screen view(expand button would be great!), - which is an awesom automatic table of contents, if you use TAGs to organize yourself. Also, the quick preview of the tagged items as I show in my screenshot was a splendid feature.
People were doing this kind of TOC since 1685 and for a good reason, - this is the way our brain feels comfortable! Evernote made it perfect, - you had it automatically after tagging, with all the benefits digital world gives you, - please consider the idea of bringing back full screen view on tags!
and 1685 version, described in this article: https://publicdomainreview.org/collection/john-lockes-method-for-common-place-books-1685