Reduce size of widgets' title bars

[TomBugnon]

Hi!

When displaying many views at the same time a lot of space is taken by the title bars (at least on Ubuntu):

Do you know if there Is any way to have control over this? Or even remove the titlebars altogether?
After this I tried the following but it doesn't work:

view = ephyviewer.SpikeTrainViewer()
from ephyviewer import QT
view.setWindowFlag(QT.Qt.FramelessWindowHint)

Thanks!