Hi
Running:
Joomla 3.7.3
T3_Blank v2.2.6
T3 Framwork v 2.6.5

See attachment - a screen print of the Joomla admin > templates > t3_blank > edit styles > navigation

All the select boxes (in all edit sections) need some additional css to make them the same height as the other fields and control boxes

This css has been missing for quite a few versions and needs adding, it looks messy and unfinished

Best regards

Ashley