How can I see long field names in the editor?

I’m using Grafana 4.6.1 (it’s been a while since I upgraded)…

When I’m editing a panel (I primarily use Elasticsearch, if that matters) and I use a long field name, the field name almost never fits in the editor’s text box. When I click in the text box to edit it, it immediately blanks out the existing text, so there’s no way to see what was there before - much less edit it.