Icons are being occluded when you shrink the actor panel in Sequencer. The expected behavior from the rest of the editor is to prioritize the functional UI elements
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1.  Create a level sequence and open it
2.  Add a few actors from your level
3.  Grab the right side of the actor panel
4.  Shrink it until you start to clip some of the actor names
Result: Icons for New Track disappear
5. Drag further until you clip track names
Result:  Key icon disappears
Expected:  Functional icons take priority over actor/track names
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-26813 in the post.
| 1 | 
| Component | UE - Anim - Sequencer | 
|---|---|
| Affects Versions | 4.11, 4.12 | 
| Target Fix | 4.17 | 
| Fix Commit | 3407229 | 
|---|---|
| Main Commit | 3432852 | 
| Created | Feb 11, 2016 | 
|---|---|
| Resolved | Apr 25, 2017 | 
| Updated | May 25, 2017 |