I had experimental set to play windowed but noticed after the update including triangle foundations that the building plan list actually pushed some items past my screens set aspect ratio. I had tried to change my aspect ratio using the menu pop up from legacy, I thought this is how I did this in the past.
I accidentally set it to full screen by selecting :window/ fullscreen option from the menu bar at the top of the screen when it was in windowed mode.
I also put in the -popinwindow command (or something to that wording) and am unsure how to undo as the Legacy menu no longer pops up.
I had it set previously to 720p for best windowed size for me but need to choose an alternate aspect ratio for windowed mode so I may see the full build menu.
Any help is appreciated.