Hi Khaled,
I notice in the new theme of the new beta version, that when we place the windows in Vertical or Horizontal, the windows that are in the corners, there is a small space in the background that I put in the mIRC. I put the green background so that you could check that the windows have a small space, not the whole space.
I leave two images for you to check.
Title VerticalTitle HorizontalThese situations do not occur in the latest version of mIRC 7.64
Hug!