Personalize Microsoft Edge with built-in theme colors

William Devereux I have different workspaces with different colors, but I can only choose one theme for all the workspaces.  This makes the browser look odd, as the tabs are the color of the theme, but the window frame is the color of the workspace. The attached screen shows the issue, the workspace is brown and the them is icy mint.  How can I get the window frame and the tabs to have the same color?  The only option available that enables that is if I choose "default", which is no theme.