When you drill down into data through the explorer you sometimes encounter dimensions that aren’t useful to the question you’re asking.
But then you just see the sources of errors and not the error messages themselves. This doesn’t answer your question about what the most common events are.
The way to do this today requires you to add “Custom event category” as an additional dimension, clicking on quick filter, and then adding a filter.
But by doing this you lose the one drill-down that you have in the explorer UI. Which I’d like to use with a custom dimension later.
So if you want to dig deeper you have to create a custom report where the nested dimensions are in a different order, or create a new report and add filters there (among multiple more time consuming ways).
It would be nice if you could click on the Quick filter and be able to add another dimension without having to select it as a secondary dimension first.
I see the challenges around making too many dimensions available through the quick filter, but including the dimensions that are in the explorer would improve the UX when digging into data. Also, then you don’t have to spend time making as many reports attacking the same data from different “dimensional directions”.