When I resize a snapped window, simultaneously resize any adjacent snapped window

This option is default in Windows 11. It can no longer be turned off.

See:

• W11 Missing: When I resize a snapped window, simultaneously resize any - Microsoft Community
  and
• Windows 11 misses the option "When I resize a snapped window, - Microsoft Community

As you can see in the 2nd link, I found the tool !AquaSnap which overrules this setting!

I mainly kept the default settings, I only de-activated the !AquaGlass setting, which makes the window you move with the mouse transparent.