The Blender3D addon allows you to select all islands/shells and their corresponding faces of the desired individual UDIM/UV-space/UV-tile. To do this, select the island/shell of the desired UDIM in the “UV Editor” mode and press Alt+L or select the corresponding item in the “UV Editor > Select > Select UDIM-matching faces&islands Alt+L” menu.
This is the zero version, it was made for myself.
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