Invisible region occupying space on startup

[PaulWeem]

Hi,

I'm having an issue with invisible regions at first start of the app.
One region is invisible at startup, but when running the app, the space occupied by this invisible region is still reserved.
After toggling visibility of this region to True and False again, the occupied space is gone and other regions are resized accordingly.

See the simple example attached.

Is there something I'm overseeing, or is this a bug?

Cheers, Paul