I am creating marked seams for UV editing (unwrapping). I found something weird that I cannot figure out. I have some faces that are separated but I never separated them on purpose. You can see in the pic inserted.
How do I join the edges so that it unwraps within the larger mesh?
Its not outlined in red, so it seems it has not been separated via seams. If you dont want to unwrap the whole island again you can stitch it together again with the stitch command. ( so select the split faces and then uv->stitch)
Its better / easier for others to hit the reply button of a post and not the thread or use @ name somewhere. I just noticed you had answered because I had your threads tab still opened in the browser.
Well it depends if we are talking of the the 3d Viewport or th UV Editor.
If its in the 3d viewport then those are separated faces, then you have a split mesh. The mesh vertices are doubled and neighboring faces along a split edge can be moved separately.
If your island selection just works like that in the uv editor, then those have been split just there, that can be done manually for unwrapping purposes . Its comparable to what happens in unwrap with border faces based on marked seams, but you did it (perhaps accidently) manually.
If they are really separated in your mesh itself you cant stitch them and unwrapping keeps them separate. You will have to merge those. ( eg via merge by distance)