It's small enough to not be intrusive on a desktop, in my opinion.
On mobile the experience is so poor (even with the mobile "skin") the button is just one out of too many niggles. I have resorted to the EN World app*, even though it means looking at ads.
*) I did have to sideload it, since it didn't appear in my Play Store (I'm on Android 5.1) no matter what variation of search phrase I used. Presumably something that only affects us not in either the UK or the US, or it would have been noticed/fixed already.