We are a large organization with different needs using a single Azure Devops organization with lots of projects. Over time lots of different marketplace extensions are being added but most of our projects do not need them and make the menu and the UX clumsy while they are beneficial for others.
Is it possible to disable some extensions in some projects only or are extensions only configurable for an entire organization?
Unfortunately @Chrizzo answer is correct.
There already are a few feature requests for this:
extensions-scoped-at-a-project-level
allow-extensions-to-be-installed-only-in-projects
Feel free to upvote them.