Resiszing window /graphic options

hey hey!

this is my first post in any video game forum really. of course, it would be for siralim

i was wondering if there will be an option for resizing the window here for siralim 3, im using steam and it wont let me unforce the game to be in full screen mode
is this intended or am i stupid and haven’t seen the proper option?

Alt + Enter

thats what ive been doing, it just force resizes to full screen anyways, if i press it really fast it strobes from my desktop for a fraction of a second then back to fullscreen. any other suggestion?