Multiple Tabs Added to Incorrect Workspace

I have 4 workspaces, reserved for different projects.  Several have pinned tabs that I frequently use.  When I open the Edge icon on my taskbar, only the first workspace opens, and, without me requesting it, it has added about 20 tabs that I don't want, probably from another workspace.  Also, Edge is not my default browser.  How can I prevent these tabs from opening?

John