This is the same issue as https://www.drupal.org/node/1252178 for D8. This request is not simply in order to bring us in feature parity with D8 - it's been mentioned in various issues like #189, #214, #801 and latest in #988. It was listed in #211 but dropped as N/A back then. Reconsider?
GitHub Issue #:
1009
Recent comments
OMG thank u... you are amazing.
Hiding Blocks for Small Screens
I use a similar module (Tocbot) which uses the same library, but the implementation is different. This is what I use to target the block: @media (max-width: 47.99em) { .js-toc-block.is-...
Hiding Blocks for Small Screens
So the implication is that another module is causing the trouble. Now for the slow process of elimination... Sounds plausible. And good luck with digging...
How to troubleshoot interactive image cropping modules?