Is it possible to add a new windowsizes, so I can use them more often?

enter new windowsize is difficult

Chrome Won't Apply Selected Dimensions

Yesterday I saw the popup showed me new size tooltip in the top right corner - and now I don't see it... How to enable it?

When I select "Open as a popup" it opens the popup, but also resizes the main browser. Is it possible to fix it?

Connaitre la taille de la fenêtre ...

www.googlechrom

Show current Bootstrap breakpoint name

Can't enter custom size directly in pop-up

I'm an old guy, with a 15 inch MacBook Pro. The main thing is sizing the screen for Facebook. A while back I had it so I can move the screen from side to side to see everything, and that was fine.