I suggest you to try any tiling window manager (arch wiki has a nice list here: https://wiki.archlinux.org/index.php/Window_manager#Tiling_window_managers).
I am currently using awesome on a (small) monitor and I found it to be much more practical than the "standard" window managers. These window managers would allow you to automatically separate the screen in order to show all the windows. Generally they are also so customizable that you could define custom ways to split the screen, special rules for certain programs, etc. On such a large monitor it would certainly be more practical than resizing the windows by hand.
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I suggest you to try any tiling window manager (arch wiki has a nice list here: https://wiki.archlinux.org/index.php/Window_manager#Tiling_window_managers). I am currently using awesome on a (small) monitor and I found it to be much more practical than the "standard" window managers. These window managers would allow you to automatically separate the screen in order to show all the windows. Generally they are also so customizable that you could define custom ways to split the screen, special rules for certain programs, etc. On such a large monitor it would certainly be more practical than resizing the windows by hand.