Class symbols dropdown not shown in "narrow" editor toolbar

On the editing toolbar, it needs to be a certain width before the symbols dropdown appears. This minimum width is quite large (unreasonably large). This was not an issue with earlier versions of Qt Creator.

Given I use an 1080HD monitor and sit two panels side by side, mostly at least one panel is suffering this bug.

I have attached screenshots that show the widths either side of the thresholds.