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When you use Direct3D 11 tiled resources in a UWP app, the tile pool resizing rules are the same as for other Direct3D 11 apps. The UWP graphics topics refer to these resources as streaming resources.
For the shared guidance on ID3D11DeviceContext2::ResizeTilePool, see Tile pool resizing (Direct3D 11). That article explains how growing or shrinking a pool affects existing mappings and when the display driver can release memory. In particular, shrinking the pool alone doesn't release memory that is still referenced by resource mappings.