Two issues with the editor when the sketch has many files:
When hovering over the downward arrow icon next to the tabs, a popup opens (rename tab, etc...). When this happens, when I try to hover to the next button to select another hidden tab, the mouse pointer must go past at least half of the next button for it to work. I noticed this behavior is not always there so it seems intermittent.
This one a bit more annoying to the user: when hovering over the tabs list icon, the popup menu appears as normally. However to keep the menu open the mouse must carefully hover downwards over the tiny green triangle, otherwise the menu closes. If the mouse moves slightly left or right, the menu closes.