Main "offender" to me is Fastener workbench
One long list of icons most of which dissapears beyond screen limits
Here I have dragged it out into the middle to show the issue (one single, undivided, very long stream of icons).
Can't even show it on vertical layout because it wouldn't be clear...
Having said so, this toolbar was an issue (at least for me) even when used in conventional UI:
and a much more sensible/flexible arrangement permitting full customisation
Sketcher toolbar: Unfortunately I have no skills to do anything about it so this is not a "complaint" just an "observation"