In Visual Studio 2015 and 2017 it was possible to choose an individual tab color for each project using the addon "Productivity Power Tools", see also http://dev.goshoom.net/2020/08/colored-tabs-in-visual-studio/
Although Visual Studio 2022 offers a possibility to enable tab colors by project (menu Tools > Options > Tabs & Windows, and enable Colorize Tabs), it looks as if the color that is assigned to each project can't be chosen by the user. Does anybody know if there's any other way to choose it?
In Visual Studio 2022 the colors for the project tabs are not fixed and can be set by the user after enabling tab color first (Tools > Options > Environment > Tabs & Windows, and enable Colorize Tabs)
You can then set the color from some predetermined options by right clicking on a file tab then selecting (Select Tab Color > YOUR COLOR CHOICE)
You can use my Tabs Studio extension to choose an individual tab color for each project:

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