I use Fedora 21 with gnome and have set the text size to LARGE (larger than the default setting) The resolution of my screen is 1366x768.
The Options Dialog (and perhaps others) exceed the screen, and hence the OK button on the bottom disappear.
The Customize Dialog on the other hand fits EXACTLY.
I know the issue of dialog sizing from my days of programming, so, perhaps the EASY solution is to make the dialog smaller. It is excessively large.
For users who don't know how to TAB their way to the OK button have no means of saving their choices.
Did some tests on Scientific Linux 7 + Gnome 3 and I can't really make this happen even with the max text scaling factor (3,0) in the Gnome Tweak Tool.
But let's give this to the design team to think over anyway.
Some kind of responsive design in this case would be nice.
Build ID: 3a87456aaa6a95c63eea1c1b3201acedf0751bd5
It would be great if you could provide a screenshot.
Closing as OP did not follow up since last year.