Why does the view show an empty column?

trying to figure out the basics here, I cant seem to find out why I have an empty column when the desktop area is widened. No matter which card in the view I take out, it always shows like:

unless I resize to 1 column width, and it shows like mobile.

I know the layout-card exists, but without understanding the above, there’s no much use trying that card (because it is as enigmatic as HA itself :wink: )

this is only happening on my home view, all others have 3 columns filled out nicely…

btw, if my conditional alerts join in, it is displayed in the empty slot:

please help me out here?