I don’t know how to call it, Bar, Tool or Toolbar? But I don’t know how to move it to the top. This problem always happen when I open an older file from Blender 2.7x in Blender 2.8. I frequently do that because I use Blender 2.7x because it’s Blender Internal Renderer is 10 times faster than Cycles, but that doesn’t mean that I don’t like Eevee.
Another question, what if I forgot to disable “Load UI” when I open the old document? And I work on the file for many hours and I cannot reopen it with “Load UI” disabled anymore, that happened to me, and the T-panel is too big, and I don’t know how to reduce its size into Blender 2.8 style.