In Ubuntu 18.04, when moving the windows there is a resize effect that occurs when accidentally touching one of the screen edges. This control was available in CCSM and Ubuntu Tweak in previous versions with Unity.
I'm not finding it in GNOME Tweaks. I also searched the repository with:
apt search ubuntu.*tweak
Open Terminal and run
You may also have to run
Doesn't Gnome have "Settings Editor" like XFCE (Xubuntu) (It has additional settings in text format for things like Thunar, XFWM4, ristretto, Displays, along with all the XFCE applications. The setting in that is in XFWM4 Uncheck "tile on move"