It's looks like there is a setting to manage it, but I don't know where is it.

When I edit UV's, Blender automatically adds Sharp Edges on the boundaries of islands. How can I disable it?

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  • $\begingroup$ Can you provide your .blend file? $\endgroup$ – Chaudhry Yousuf Mar 22 at 8:17
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    $\begingroup$ Huh, was able to reproduce. It's a bug, and you should consider a bug report. To prevent it from happening, unhide the rest of your mesh (or if you want, just unhide the verts adjacent to the ones you're editing.) $\endgroup$ – Nathan Mar 22 at 8:29
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    $\begingroup$ wow, it's looks like a fixed bug, affects 2.91 but not 2.92... $\endgroup$ – Crantisz Mar 22 at 8:35

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