How to keep tool window layout and state separate for separate projects

Problem

If multiple projects are opened in the same Rider instance, opening a tool widow in one project will affect the state of the same tool window in other opened projects. For example, opening the NuGet tool window in one project will lead to the same tool window being opened in the other projects.

Cause

This is the intended default behavior because by default the option Window → Layout settings → Use Unique Layout for Every Project is disabled.

Answer

This behavior can be changed by going to Window → Layout settings → Use Unique Layout for Every Project. With this option enabled, Rider will separate layouts for every project

So, for example, opening the NuGet tool window in one project will not affect tool windows in another project.